Table 1.

Characteristics of the study subjects

Characteristic	Responders (n = 53), %	Non-responders (n = 142), %	p-Value
Sex			0.59
Female	75.5	71.6
Male	24.5	28.4
Age (years), median	29.0	37.0	0.03b
University degreea	48.2	49.6	0.63
Country of birth			0.09
Germany	83.0	91.5
Other	17.0	8.5
Number of household members			0.32
Living alone	28.3	20.4
+ 1 member	41.5	38.7
+ ≥2 members	30.2	40.9
Means of getting to the work place			0.09
On foot	32.1	19.7
By public transport	13.2	9.2
By car	54.7	71.1
Smoking status			0.07
Non-smoker	54.7	69.3
Ex-smoker	24.5	21.2
Current smoker	20.8	9.5

^aIncluding universities of applied sciences.

^bMann–Whitney U-test.