Table 1. Baseline characteristics for the study population and the sub-population with self-reported allergic rhinitis.

	Total population		Self-reported allergic rhinitis
	N	%	N	%
Female	1,898	54.2	481	56.3
Male	1,592	45.5	371	43.4
Missing or no answer	11	0.3	3	0.4
Total	3,501	100	855	100
Present employment a
Full-time employment	2,150	61	554	64.8
Part-time employment	616	18	144	16.8
Full-time student	174	5	49	5.7
Part-time student	42	1	11	1.3
Other working situation	621	18	135	15.8
Missing or no answer	35	1	2	0.2
Smoking/day
Yes, daily, >1 package	24	0.7	3	0.4
Yes, daily, ~1 package	78	2	16	1.9
Yes, daily, <1 package	286	8	46	5.4
Former smoker	1,002	29	222	26.0
Never smoked	2,093	60	561	65.6
Missing or no answer	18	0.5	7	0.8
Total	3,501	100	855	100
Diagnosis by doctor a
Allergic nasal and/or eye problems	629	18	516	60.4
Non-allergic nasal problems	72	2	33	3.9
Asthma	318	9	187	21.9
Eczema	401	11.5	146	17.1
COPD	35	1	8	0.9
None of these diagnoses	2,388	68	251	29.4
Missing or no answer	35	1	8	0.9

Abbreviation: COPD, chronic obstructive pulmonary disease.

Any value for the total population includes the group with self-reported allergic rhinitis.

^aSeveral alternatives could be specified.