At the specified date, a patient is defined as having had 'Abdominal Hernia' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Abdominal Hernia' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Abdominal Hernia' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Abdominal Hernia'  during a hospitalization

Use MODIFIED CALIBER 'Abdominal aortic aneurysm' phenotyping algorithm:

At the specified date, a patient is considered to have an 'Abdominal aortic aneurysm' IF they meet any of the criteria below on or before the specified date. 

The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:
1.	Primary care 
    1.	Diagnosis of AAA during a consultation: arterial_gprd: category 4
    2.	Performance of emergency AAA repair procedure recording during a consultation: aaa_ops_gprd: category 3
    3.	History of AAA during a consultation. The following Read code from CPRD:
    1.	Read:14AE.00	Medcode:16993	Descr:H/O: aortic aneurysm
2.	Secondary care 
    1.	Diagnosis of AAA as the primary or secondary diagnosis of any hospitalization: arterial_hes: category 4
    2.	Performance of emergency AAA repair procedure recorded: aaa_ops_opcs: category 3

At the specified date, a patient is defined as having had 'Acne' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Acne' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Acne' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Actinic keratosis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Actinic keratosis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Actinic keratosis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Acute Kidney Injury' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Secondary care
1. ALL diagnoses of 'Acute Kidney Injury' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Agranulocytosis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Agranulocytosis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Agranulocytosis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Alcohol Problems IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Alcohol Problems diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Alcohol Problems or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Alcoholic liver disease' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Alcoholic liver disease' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Alcoholic liver disease' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Allergic and chronic rhinitis IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Allergic and chronic rhinitis diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of Allergic and chronic rhinitis or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Alopecia areata' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Alopecia areata' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Alopecia areata' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Anal fissure' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Anal fissure' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Anal fissure' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Anal fissure' during a hospitalization

At the specified date, a patient is defined as having had 'Angiodysplasia of colon' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Angiodysplasia of colon' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Angiodysplasia of colon' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Ankylosing spondylitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Ankylosing spondylitis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Ankylosing spondylitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Anorectal fistula' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Anorectal fistula' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Anorectal fistula' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Anorectal fistula' during a hospitalization

At the specified date, a patient is defined as having had 'Anorectal prolapse' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Anorectal prolapse' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Anorectal prolapse' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Anorectal prolapse' during a hospitalization

At the specified date, a patient is defined as having had Anorexia and bulimia nervosa IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Anorexia and bulimia nervosa diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Anorexia and bulimia nervosa or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Anterior and Intermediate Uveitis IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Anterior and Intermediate Uveitis diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Anterior and Intermediate Uveitis or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Anxiety disorders' disorders IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Anxiety disorders' disorders diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Anxiety disorders' disorders or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Aplastic anaemias' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Aplastic anaemias' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Aplastic anaemias' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Appendicitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Appendicitis' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Appendicitis' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Appendicitis' during a hospitalization

At the specified date, a patient is defined as having had 'Asbestosis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Asbestosis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Asbestosis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Aspiration pneumonitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Aspiration pneumonitis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Aspiration pneumonitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Asthma' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Asthma' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Asthma' or history of diagnosis during a hospitalization

Use MODIFIED CALIBER 'Atrial fibrillation' phenotyping algorithm: 

At the specified date, a patient is considered to have had 'Atrial fibrillation' or flutter IF they meet any of the criteria below on or before the specified date. 

The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:
1.	1.	Historical & Diagnosed: first recorded AF code indicates monitoring of an existing condition, or reference to a previous AF diagnosis, or a diagnosis code for AF; preference given to the earliest dated record rather than diagnosis source (i.e. no preference for primary versus secondary care).
    1.	af_gprd: category 1, 2, 3, 4, 5, 6, 7
    2.	af_hes: category 6

At the specified date, a patient is defined as having had Atrioventricular third degree, complete IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Atrioventricular block, complete diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of Atrioventricular block, complete or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Atrioventricular block, first degree' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Atrioventricular block, first degree' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Atrioventricular block, first degree' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Atrioventricular block, second degree' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Atrioventricular block, second degree' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Atrioventricular block, second degree' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Autism and Asperger's syndrome' and Asperger's syndrome IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Autism and Asperger's syndrome' and Asperger's syndrome diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Autism and Asperger's syndrome' and Asperger's syndrome or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Autoimmune liver disease' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Autoimmune liver disease' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Autoimmune liver disease' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Bacterial Diseases (excl TB)' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Secondary care
1. ALL diagnoses of Bacterial Diseases (excl TB) or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Bacterial sepsis of newborn IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Bacterial sepsis of newborn diagnosis or history of diagnosis during a consultation AND IF the patient is aged < 1y at the first event date
OR
Secondary care
1. ALL diagnoses of  Bacterial sepsis of newborn or history of diagnosis during a hospitalization AND IF the patient is aged < 1y at the first event date

At the specified date, a patient is defined as having had 'Barrett's oesophagus' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Barrett's oesophagus' diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Barrett's oesophagus' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Bell's palsy' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Bell's palsy' diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Bell's palsy' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Benign neoplasm and polyp of uterus IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Benign neoplasm and polyp of uterus diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Benign neoplasm and polyp of uterus or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Benign neoplasm of brain and other parts of central nervous system IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Benign neoplasm of brain and other parts of central nervous system diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Benign neoplasm of brain and other parts of central nervous system or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Benign neoplasm of colon, rectum, anus and anal canal IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Benign neoplasm of colon, rectum, anus and anal canal diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Benign neoplasm of colon, rectum, anus and anal canal or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Benign neoplasm of ovary IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Benign neoplasm of ovary diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Benign neoplasm of ovary or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Benign neoplasm of stomach and duodenum IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Benign neoplasm of stomach and duodenum diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Benign neoplasm of stomach and duodenum or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Bifascicular block' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Bifascicular block' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Bifascicular block' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Bipolar affective disorder and mania' and mania IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Bipolar affective disorder and mania' and mania diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Bipolar affective disorder and mania' and mania or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Bronchiectasis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Bronchiectasis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Bronchiectasis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had COPD IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. COPD diagnosis or history of diagnosis during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of COPD or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had Carcinoma in situ_cervical IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Carcinoma in situ_cervical diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of Carcinoma in situ_cervical or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Carpal tunnel syndrome' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Carpal tunnel syndrome' diagnosis, history of diagnosis or procedure during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Carpal tunnel syndrome' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Carpal tunnel syndrome' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Cataract' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Cataract' diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Cataract' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Cataract' during a hospitalization

At the specified date, a patient is defined as having had 'Cerebral Palsy' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Cerebral Palsy' diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Cerebral Palsy' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Cholangitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Cholangitis' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Cholangitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Cholecystitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Cholecystitis' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Cholecystitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Cholelithiasis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Cholelithiasis' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Cholelithiasis' or history of diagnosis during a hospitalization

Apply modified CALIBER 'Chronic Kidney Disease' algorithm in CPRD primary care data as follows:

A patient is defined as having had CKD stage 3 or above at a specified date:

IF egfr_ckdepi recorded on or before specified date, THEN 
IF egfr_ckdepi <60 ml/min on the most recent date (index date) before the specified date
AND
IF egfr_ckdepi <60 ml/min on any date greater than 90 days BEFORE the index date above
THEN classify as having CKD3 or above
ELSE the patient is not defined as having CKD stage 3 or above.

Where egfr_ckdepi up to and including 31 Dec 2013 is defined as: 
egfr_ckdepi = 141 * min(crea_gprd * 0.010746 / K, 1)^alpha
* max(crea_gprd * 0.010746 / K, 1)^-1.209 
* 0.993^age * 1.018 [if female]  * 1.159 [if black]

where:
alpha = -0.329 for females, -0.411 for males
K = 0.7 for females, 0.9 for males

Where egfr_ckdepi from and including 1 Jan 2014 is defined as: 
egfr_ckdepi = 141 * min(crea_gprd * 0.010746 / K, 1)^alpha
* max(crea_gprd * 0.0.011312/ K, 1)^-1.209 
* 0.993^age * 1.018 [if female]  * 1.159 [if black]

where:
alpha = -0.329 for females, -0.411 for males
K = 0.7 for females, 0.9 for males

Where crea_gprd is defined as:
IF enttype = 165 [Serum creatinine] 
AND data1 [Operator] = 3 ["="] AND data2 [Value] > 0
THEN crea_gprd = data2

At the specified date, a patient is defined as having had 'Chronic sinusitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Chronic sinusitis' diagnosis or history of diagnosis during a consultation 
OR
2.  There are at least 2 records satisfying the criteria for Possible diagnosis of 'Chronic sinusitis' during a consultation more than 84 days apart. 

Secondary care (ICD10)
1. ALL diagnoses of 'Chronic sinusitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Chronic viral hepatitis' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Chronic viral hepatitis' diagnosis or history of diagnosis during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Chronic viral hepatitis' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Coeliac disease' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Coeliac disease' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care
1. ALL diagnoses of 'Coeliac disease' or history of diagnosis during a hospitalization

At the specified date, a patient is defined as having had 'Collapsed vertebra' IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. 'Collapsed vertebra' diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of 'Collapsed vertebra' or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for 'Collapsed vertebra' during a hospitalization

At the specified date, a patient is defined as having had Congenital malformations of cardiac septa IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Congenital malformations of cardiac septa diagnosis or history of diagnosis or procedure during a consultation 
OR
Secondary care (ICD10)
1. ALL diagnoses of Congenital malformations of cardiac septa or history of diagnosis during a hospitalization
OR
Secondary care (OPCS4)
1. ALL procedures for Congenital malformations of cardiac septa during a hospitalization