Table 1.

Descriptive statistics of the four occupational classes among 2454 male employees of the City of Helsinki aged 20–34 years

	Total				Occupational class
	N	%/(SD)	OHS visits p.a.		Managers or professionals		Semiprofessionals		Routine non-manual workers		Manual workers
			N	1/1000	N	%/(SD)	N	%/(SD)	N	%/(SD)	N	%/(SD)
Total	2454	100	2528	1030.3	594	100	286	100	677	100	897	100
The length of the follow-up in days, average (SD)	1341	(252)			1371	(204)	1382	(191)	1290	(292)	1348	(260)
OHS visits per annum, 1/1000 (SD)	1030.3	(1435.3)			705.4	(939.4)	996.5	(1151.3)	1121.5	(1482.1)	1187.3	(1695.8)
Outcome: Trajectory group
1. No OHS visits	1337	54.5	225	168.5	374	63	148	51.7	349	51.6	466	52
2. Low/increasing	420	17.1	626	1489.3	91	15.3	54	18.9	131	19.4	144	16.1
3. Low/decreasing	496	20.2	728	1468.2	113	19	63	22	138	20.4	182	20.3
4. High/recurrent	201	8.2	949	4722.6	16	2.7	21	7.3	59	8.7	105	11.7
Covariates
Age (years)
20–24	618	25.2	684	1107.2	23	3.9	38	13.3	221	32.6	336	37.5
25–29	1077	43.9	996	924.6	299	50.3	152	53.1	296	43.7	330	36.8
30–34	759	30.9	848	1117.6	272	45.8	96	33.6	160	23.6	231	25.8
First language
Finnish	2154	87.8	2219	1029.9	499	84	272	95.1	589	87	794	88.5
Swedish	81	3.3	36	438.3	47	7.9	2	0.7	24	3.5	8	0.9
Other	193	7.9	256	1327.7	24	4	12	4.2	62	9.2	95	10.6
Education
Basic education/lower secondary	1595	65	1807	1132.8	136	22.9	115	40.2	530	78.3	814	90.7
Upper secondary	476	19.4	453	951.2	126	21.2	149	52.1	130	19.2	71	7.9
Higher education	383	15.6	269	701.7	332	55.9	22	7.7	17	2.5	12	1.3

Results are based on register data covering the years from 2004 to 2017.

OHS, occupational health service.