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

Table 3 Age-adjusted odds ratios (95% Confidence Intervals) for self-reported insomnia by educational level, employment status and household income level during different study periods between years 1979–2002, women

	Age-adjusted model							Age + all SES variables		Age + all SES variables + depression
	79-82	83-87	88-92	93-97	98-02	1979-2002 ¹		1979-2002 ¹		1979-2002 ¹
	OR	OR	OR	OR	OR	OR	95% CI	OR	95% CI	OR	95% CI
Educational level
Highest	1.00	1.00	1.00	1.00	1.00	1.00		1.00		1.00
Intermediate	0.98	0.95	1.04	1.05	1.04	1.00	0.93-1.08	0.98	0.91-1.06	0.98	0.91-1.06
Lowest	1.08	1.15	1.20	1.09	1.09	1.12	1.04-1.21	1.06	0.98-1.15	1.05	0.97-1.14
Interaction study period*educational level p = .054
Employment status
Employed	1.00	1.00	1.00	1.00	1.00	1.00		1.00		1.00
Student	1.20	0.97	0.81	1.20	1.33	1.18	0.98-1.43	1.18	0.98-1.43	1.13	0.92-1.39
Housewife	1.04	1.08	1.05	0.97	0.75	1.01	0.92-1.11	0.99	0.90-1.10	0.95	0.86-1.06
Retired	2.01	1.65	1.71	1.71	1.53	1.70	1.56-1.86	1.66	1.51-1.82	1.39	1.26-1.53
Unemployed	1.79	1.95	2.12	1.62	1.91	1.80	1.60-2.02	1.74	1.55-1.96	1.39	1.22-1.58
Interaction study period*employment status p = .001
Household income
Highest	1.00	1.00	1.00	1.00	1.00	1.00		1.00		1.00
2. highest	1.00	1.09	0.91	0.96	0.86	0.96	0.88-1.04	0.93	0.85-1.02	0.91	0.83-0.99
Middle	0.94	0.92	0.91	0.83	0.94	0.91	0.84-0.99	0.85	0.78-0.93	0.84	0.76-0.92
2. lowest	1.06	1.11	0.99	0.98	1.01	1.03	0.95-1.12	0.93	0.85-1.02	0.90	0.81-0.99
Lowest	1.29	1.14	1.17	1.06	1.05	1.17	1.08-1.27	0.99	0.90-1.08	0.90	0.82-0.99
Interaction study period*household income level p = .844

ISSN: 1471-2458