Table 1

Background characteristics of responders at baseline (n=9961) and responders at both time points (n=6745)

	Baseline sample			Follow-up sample at baseline
	N	%	Cases (%)*	N	%	Cases (%)*
Age
18–24 years	999	10.0	10.0	459	6.8	8.3
25–34 years	2012	20.2	10.2	1343	19.9	9.6
35–44 years	2665	26.8	13.7	2000	29.7	12.3
45–54 years	2396	24.1	14.4	1823	27.0	13.3
55–66 years	1889	19.0	14.7	1120	16.6	11.7
Sex
Men	5236	52.6	11.5	3538	52.5	10.4
Women	4725	47.4	14.6	3207	47.5	13.1
Both	9961	100.0	13.0	6745	100.0	11.7
Education level
Basic school level	683	7.0	17.6	368	5.5	17.4
Upper secondary education not finished	2385	24.4	16.8	1373	20.6	13.7
Upper secondary education	3132	32.0	12.7	2143	32.2	12.6
University/college 4 y	2701	27.6	10.8	2073	31.1	10.2
University/college 4 years+	880	9.0	5.9	702	10.5	6.0
Missing	180			51
Occupation
Legislators, senior officials and manager	952	9.6	10.3	686	10.3	8.6
Professionals	1411	14.2	9.4	1086	16.2	9.2
Technicians and associate professionals	2547	25.6	11.0	1920	28.7	10.7
Clerks	646	6.5	14.6	414	6.2	10.1
Service workers and shop and market sales workers	2026	20.3	16.6	1192	17.8	14.9
Skilled agricultural and fishery workers	220	2.2	15.5	154	2.3	15.2
Craft and related trades workers	1001	10.1	13.1	638	9.5	12.9
Plant and machine operators and assemblers	643	6.5	15.2	359	5.4	11.1
Elementary occupations	343	3.4	19.5	144	2.2	15.3
Other occupations	170	1.7	13.0	97	1.4	14.5
Missing	1
Psychological distress
No symptoms	8352	84.1	11.4	5711	85.4	10.4
Symptom	1583	15.9	21.1	980	14.6	18.9
Missing	26