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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

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

  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
  1. 1Adjusted for study period.
  2. *Significant odds ratios in bold.