Table 1.

Definitions of variables (short designations within parentheses)

Variable	Definition
Age	dichotomous yes/no, >70 years
Gender	dichotomous yes/no, male
Smoking status	dichotomous yes/no, current or ex‐smoker
Alcohol consumption	dichotomous yes/no, alcohol intake> 2 times/week
Physical fitness	dichotomous yes/no, ability to climb two flights of stairs
Body mass index (BMI)	dichotomous yes/no, BMI> 35
Occurrence of diabetes (diabetes)	dichotomous yes/no
Ongoing systemic cortisone treatment (cortisone treatment)	dichotomous yes/no
PPI medication	dichotomous yes/no
Ongoing antibiotic treatment initiated> 24 h before admission (antibiotics before hospitalisation)	dichotomous yes/no
Lung disease at admission	dichotomous yes/no
Acute admission to hospital (acute admission)	dichotomous yes/no
Antibiotic treatment for> 24 h during hospitalization (antibiotics during hospitalization)	dichotomous yes/no
Hospital‐acquired pneumonia	dichotomous yes/no
Gastrointestinal surgery during hospitalization (abdominal surgery)	dichotomous yes/no