Table 1

Baseline characteristics of respondents and dropouts

Characteristics at baseline	Respondents (n = 4931)		Dropouts (n = 632)
Characteristics at baseline	n	%	n	%
*In quintiles.
Gender
Male	191	3.9	37	5.9
Female	4739	96.1	93	94.1
Age
<30	345	7.0	81	12.8
30–39	932	18.9	161	25.5
40–49	2027	41.1	257	40.7
50–59	1417	28.7	114	18.0
>59	209	4.2	19	3.0
Daily consumption of cigarettes
0	2770	57.3	314	50.6
1–9	1098	22.7	171	27.6
⩾10	970	20.0	135	21.8
Affective symptoms*
1 and 2	2113	43.2	248	39.8
3	938	19.2	89	14.3
4	882	18.0	134	21.5
5	958	19.6	152	24.4
Commitment to the work unit*
1	856	17.5	133	21.2
2	986	20.1	128	20.4
3	868	17.7	121	19.3
4	1415	28.9	162	25.8
5	779	15.9	83	13.2
Role conflicts at work*
1	781	15.9	84	13.4
2	1164	23.8	125	19.9
3	785	16.0	78	12.4
4	1408	28.7	217	34.6
5	762	15.6	124	19.7
Encouraging and supportive culture in the work unit
Very little or not at all	71	1.5	12	2.0
Rather little	285	5.9	46	7.5
Some	1142	23.7	155	25.3
Rather much	2006	41.7	245	40.0
Very much	1305	27.1	154	25.2
Fairness in superior’s leadership*
1	1092	22.2	154	24.4
2	506	10.3	82	13.0
3	1490	30.3	189	30.0
4	545	11.1	65	10.3
5	1278	26.0	140	22.2
Threats or violence at work (previous two years)
Never or very seldom	3018	61.4	353	56.1
Rather seldom	631	12.8	89	14.1
Sometimes	821	16.7	119	18.9
Rather often	346	7.0	49	7.8
Very often	96	2.0	19	3.0