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Table 3 The hazard ratios and the confidence intervals of the fitted model for shorter sleep. The effect of the birth cohorts is compared to those born in 1880–1899. The effect of age group is compared to those being 18–34 years old. Male gender is compared to females

From: Changes in self-reported sleep duration with age - a 36-year longitudinal study of Finnish adults

  Hazard ratio (95% CI)
Birth cohort < 1900 1.00
Birth cohort 1900–1919 1.11 (0.96 to 1.30)
Birth cohort 1920–1939 1.41 (1.21 to 1.64)
Birth cohort 1940–1957 1.62 (1.40 to 1.89)
Age group 18–34 years 1.00
Age group 35–54 years 1.24 (1.21 to 1.28)
Age group 55+ years 1.23 (1.19 to 1.27)
Female gender 1.00
Male gender 1.13 (1.10 to 1.15)