Skip to main content

Table 2 Prespecified definitions for baseline conditions

From: Feasibility of randomizing Danish citizens aged 65–79 years to high-dose quadrivalent influenza vaccine vs. standard-dose quadrivalent influenza vaccine in a pragmatic registry-based setting: rationale and design of the DANFLU-1 Trial

Condition

ICD-10/ATC codes

Diagnosis type

Inpatient/outpatient/minimum required length of stay/other criteria

Timeframe

Chronic obstructive pulmonary disease

J42-J44

A or B

Any

≤ 10 years prior to randomization

Asthma

J45

A or B

Any

≤ 10 years prior to randomization

Chronic lung disease

A15-A16, D860, E84, J42-J47, J84, Z942

A or B

Any

≤ 10 years prior to randomization

Diabetes (ICD-10)

E10-E14

A or B

Any

≤ 10 years prior to randomization

Diabetes (ATC)

A10

≥ 1 claimed prescription

≤ 180 days prior to randomization

Hypertension (ICD-10)

I10-I15

A or B

Any

≤ 10 years prior to randomization

Hypertension (ATC)

Diuretics: C03

β-blockers: C07

Calcium blockers: C08

Renin-angiotensin system inhibitors: C09

≥ 1 claimed prescription from ≥ 2 drug classes

≤ 180 days prior to randomization

Dyslipidemia (ATC)

C10

≥ 1 claimed prescription

≤ 180 days prior to randomization

Ischemic heart disease

I20-I25

A or B

Any

≤ 10 years prior to randomization

Myocardial infarction

I21

A or B

Any

≤ 10 years prior to randomization

Heart failure

I50

A or B

Any

≤ 10 years prior to randomization

Other cardiomyopathy

I42-I43

A or B

Any

≤ 10 years prior to randomization

Atrial fibrillation

I48

A or B

Any

≤ 10 years prior to randomization

Other arrhythmia

I44-I47, I49

A or B

Any

≤ 10 years prior to randomization

Valvular disease

I34-I37

A or B

Any

≤ 10 years prior to randomization

Pericarditis

I30-I31

A or B

Any

≤ 10 years prior to randomization

Endocarditis

I33, I38-I39

A or B

Any

≤ 10 years prior to randomization

Myocarditis

I40-I41

A or B

Any

≤ 10 years prior to randomization

Pulmonary heart disease

I26-I28

A or B

Any

≤ 10 years prior to randomization

Cerebrovascular disease

I60-I69

A or B

Any

≤ 10 years prior to randomization

Peripheral vascular disease

I70, I74

A or B

Any

≤ 10 years prior to randomization

Congenital heart disease

Q20-Q26

A or B

Any

≤ 10 years prior to randomization

Chronic cardiovascular disease

I20-I28, I34-I37, I42-I50, I60-I69, I70, I74, Q20-Q26

A or B

Any

≤ 10 years prior to randomization

Cancer

C00-C97 (not C44)

A or B

Any

≤ 10 years prior to randomization

Chronic kidney disease

E102, E112, E132, E142, I120, N02-N08, N11-N12, N14, N18-N19, N26, N158-N160, N162-N164, N168, M300, M313, M319, M321B, Q612-Q613, Q615, Q619, T858-T859, Z992

A or B

Any

≤ 10 years prior to randomization

Liver disease

B15-B19, K70-K77, C22, I982, Z944, D684C, Q618

A or B

Any

≤ 10 years prior to randomization

Immunodeficiency (ICD-10)

B20-B24, D80-D84, D89, O987, Z21, Z940-Z944, Z948A

A or B

Any

≤ 10 years prior to randomization

Immunodeficiency (ATC)

H02AB, L04

≥ 1 claimed prescription

≤ 180 days prior to randomization

Neurological/neuromuscular disease

F00-F03, G10-G14, G20-G23, G30-G32, G35-G37, G40-G41, G70-G73, G80-G83, G91-G95

A or B

Any

≤ 10 years prior to randomization

Dementia

F00-F03, G30, G311-G312,

A or B

Any

≤ 10 years prior to randomization

Rheumatic disease

M05-M06, M32-M34, M353

A or B

Any

≤ 10 years prior to randomization

  1. All baseline conditions are defined from ICD-10 codes except for diabetes, hypertension, dyslipidemia, and immunodeficiency, where ATC codes are also used. ICD International Classification of Diseases, ATC anatomic therapeutic chemical