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Table 2 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, men

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 1979-20021 1979-20021 1979-20021
  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 1.07 1.07 1.11 1.15 1.17 1.13 1.04-1.22 1.09 1.00-1.18 1.07 0.98-1.17
Lowest 1.08 1.11 1.24 1.26 1.27 1.20 1.11-1.29 1.11 1.02-1.20 1.10 1.01-1.20
Interaction study period*educational level p = .964
Employment status            
Employed 1.00 1.00 1.00 1.00 1.00 1.00   1.00   1.00  
Student 1.36 1.08 1.21 1.39 2.06 1.44 1.17-1.77 1.43 1.16-1.76 1.35 1.08-1.70
Retired 2.74 2.54 2.09 2.06 1.72 2.18 1.99-2.39 2.16 1.96-2.38 1.73 1.56-1.92
Unemployed 2.47 3.06 3.01 2.09 2.51 2.48 2.22-2.76 2.42 2.16-2.71 1.76 1.55-2.00
Interaction study period*employment status p = .009
Household income            
Highest 1.00 1.00 1.00 1.00 1.00 1.00   1.00   1.00  
2. highest 0.99 1.04 0.76 0.96 1.03 0.95 0.87-1.04 0.89 0.81-0.98 0.87 0.79-0.96
Middle 1.02 1.12 0.86 0.95 0.93 0.96 0.88-1.06 0.85 0.77-0.94 0.80 0.72-0.89
2. lowest 1.02 0.98 1.03 0.89 0.98 0.98 0.90-1.08 0.81 0.73-0.89 0.75 0.68-0.83
Lowest 1.30 1.39 1.13 1.35 1.55 1.34 1.23-1.46 0.98 0.89-1.08 0.89 0.80-0.99
Interaction study period*household income level p = .269
  1. 1Adjusted for study period.
  2. *Significant odds ratios in bold.