BMC Public Health

Table 1 Description of the data

From: Socio-economic differences in self-reported insomnia and stress in Finland from 1979 to 2002: a population-based repeated cross-sectional survey

	Study periods										Total period
	1979–1982		1983–1987*		1988–1992		1993–1997		1998–2002		1979–2002
	%	N	%	N	%	N	%	N	%	N	%	N
Men
Insomnia	17	1267	16	950	17	1209	18	1193	20	1289	18	5908
Stress	16	1215	17	1023	19	1325	20	1326	20	1298	19	6187
Age
25-34	32	2378	30	1760	27	1941	24	1589	21	1329	27	8997
35-44	27	2043	30	1752	30	2148	27	1774	26	1667	28	9384
45-54	23	1723	22	1261	23	1645	28	1843	30	1920	25	8392
55-64	18	1314	19	1102	20	1420	21	1405	23	1479	20	6720
Educational level
Highest	20	1451	22	1297	25	1790	28	1827	33	2071	25	8436
Intermediate	26	1936	31	1784	35	2500	39	2592	41	2596	34	11408
Lowest	54	4033	47	2744	40	2840	33	2173	27	1712	41	13502
Employment status
Employed	86	6284	85	4951	82	5870	73	4714	78	4738	81	26557
Student	2	109	1	81	2	155	2	139	2	142	2	626
Retired	10	728	11	655	12	881	13	830	12	739	12	3833
Unemployed	2	174	3	150	3	228	12	756	8	481	5	1789
Total N		7458		5875		7154		6611		6395		33493
	1979–1982		1983–1987*		1988–1992		1993–1997		1998–2002		1979–2002
	%	N	%	N	%	N	%	N	%	N	%	N
Women
Insomnia	19	1292	17	1171	17	1372	19	1408	21	1583	19	6826
Stress	12	830	14	925	15	1198	19	1405	18	1356	16	5714
Age
25-34	30	2025	28	1883	26	2116	25	1889	22	1649	26	9562
35-44	23	1569	27	1834	30	2434	28	2118	27	1985	27	9940
45-54	22	1487	22	1457	23	1881	28	2113	30	2194	25	9132
55-64	26	1766	23	1552	20	1599	20	1501	21	1570	22	7988
Educational level
Highest	16	1109	22	1467	26	2079	33	2470	37	2759	27	9884
Intermediate	26	1756	31	2069	35	2778	37	2836	39	2870	34	12309
Lowest	58	3966	47	3146	39	3164	30	2302	24	1756	40	14334
Employment status
Employed	69	4626	74	4942	75	5993	69	5159	73	5193	72	25913
Student	1	84	2	111	3	218	3	253	3	223	3	889
Housewife	16	1098	12	773	9	698	8	597	6	444	10	3610
Retired	12	775	11	718	11	910	10	755	10	721	11	3879
Unemployed	2	146	2	148	2	178	9	676	8	539	5	1687
Total N		6847		6726		8030		7621		7398		36622

Distribution of age, educational level and employment status by different study periods.
* Year 1985 is missing.
** Household income variable was divided into equal size quintiles, not shown in the table.
Prevalence (%) of self-reported insomnia and stress.

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