	Missing	n	%
Sex	0
Female		938	55.6
Study centre	0
Dresden		845	49.9
Socioeconomic status	8
High		1103	65.1
Smoking status	15
Never smoker		926	55.1
Ex-smoker		156	9.3
Current smoker		598	35.6
Current occupation	0
Apprentice		259	15.3
Student		829	48.9
Employed		459	27.1
Self-employed		19	1.1
Job seeking		77	4.5
Not working due to poor health		6	0.4
Homekeeper		2	0.1
Parental leave		24	1.4
Other		20	1.2
Occupational exposure to sensitising agents	0
Never worked		399	23.5
Only no risk jobs		558	32.9
At least one low risk job		330	19.5
At least one high risk job		408	24.1
Spray use*	27
No use		341	20.4
Low use		653	39.1
Medium use		535	32.1
High use		139	8.3
Disinfectant use*	131
No use		1310	83.8
Low/medium use		127	8.1
High use		127	8.1

*No use: composite score=0; low use: score between 1 and the median; medium use: score between the median and the 90th percentile; high use: score above the 90th percentile.