Table 2 Predicting variables present in ten random sets and in the final model

Gender

male/female

Current smoking

reported smoking yes/no

Year of onset of COPD

numerical variable

Age at onset of COPD

numerical variable

Age at onset of asthma

numerical variable

Duration of COPD

numerical variable

Hypertension

diagnosed hypertension with medication yes/no

Cerebrovascular disease

diagnosed cerebrovascular disease yes/no

Peripheral artery occlusive disease

diagnosed peripheral artery occlusive disease yes/no

Any cardiovascular disease

diagnosed any cardiovascular disease yes/no

Diabetes

diagnosed diabetes yes/no

Metabolic syndrome

diagnosed metabolic syndrome yes/no

Hypercholesterolemia

diagnosed hypercholesterolemia with medication yes/no

Hypothryreosis

diagnosed hypothyreosis with medication yes/no

Alcoholism

diagnosed alcoholism yes/no

Cancer

diagnosed cancer yes/no

Atrial fibrillation

diagnosed permanent atrial fibrillation yes/no

Psychiatric disease

diagnosed any psychiatric disease yes/no

Body mass index

1. BMI < 20

2. BMI 20–25

3. BMI 25.1 – 30

4. BMI > 30

Body mass index change

numerical variable

DLcCOVA % of predicted

numerical variable

RV % of predicted

numerical variable

FVC baseline % of predicted

numerical variable

FEV₁ at baseline % of predicted

numerical variable

QRS axel in ECG

numerical variable

QTc duration in ECG

numerical variable

QRS duration in ECG

numerical variable