Table 2. Overview of demographic characteristics of all patients at the baseline visit (n = 1,025, discrepancies in totals for the different variables are due to missing data).

Baseline characteristics	Number of patients
Sex
Male	591 (57.7%)
Female	434 (42.3%)
Age, mean (SD)	41.7 (14.6) (n = 1,025)
BMI, mean (SD)	25.9 (5.4) (n = 1,009)
Marital status
Solid partnership, unmarried	265 (26.2%)
Married	391 (38.6%)
Divorced	42 (4.2%)
Widowed	11 (1.1%)
Single	303 (29.9%)
Education level
Without school-leaving qualification	8 (0.8%)
Lower secondary school graduates	124 (12.2%)
Secondary school diploma	377 (37.2%)
High school diploma	259 (25.5%)
University degree	246 (24.3%)
Gainful employment
Not employed	227 (22.4%)
Employed	788 (77.6%)
Employment status
Full-time (35 hours and more)	574 (73.2%)
Part time or hourly	172 (21.9%)
Leave of absence (parental leave or similar)	8 (1.0%)
Trainee, re-trainee	30 (3.8%)
Non-employed persons
Pensioner/retiree in early retirement	71 (32.0%)
Househusband/Housewife	24 (10.8%)
Pupil/student	67 (30.2%)
Unemployed	46 (20.7%)
Early retiree	14 (6.3%)
Smoker status
Smoker	246 (24.2%)
Ex-smoker (< 10 years not smoked)	143 (14.1%)
Ex-smoker (≥ 10 years not smoked)	109 (10.7%)
Never smoked	517 (50.9%)
Allergic comorbidities
Allergic rhinoconjunctivitis (hay fever)	650 (65.9%)
Bronchial asthma	443 (44.3%)
Other comorbidities
Arterial hypertension	189 (18.8%)
Heart failure (≥ NYHA III)	5 (0.5%)
Previous myocardial infarction (queried since 2018)	7 (0.9%)
Previous Apoplex (queried since 2018)	4 (0.5%)
Diabetes mellitus type 1	1 (0.1%)
Diabetes mellitus type 2	36 (3.5%)
Crohn’s disease/Colitis ulcerosa	12 (1.2%)
Renal failure	11 (1.1%)
Rheumatoid arthritis	3 (0.3%)
Depression	97 (9.7%)
Cancers (queried since 2018)	16 (2.0%)

SD = standard deviation.