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Table 2 Sleep duration (hours; mean, standard deviation) in each of the four questionnaires

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

Year of questionnaire Men Women Age group
18–34 years
Age group
35–54 years
Age group
55+ years
1975 7.57, 0.95 7.69, 0.98 7.69, 0.92 7.57, 0.93 7.52, 1.20
1981 7.53, 0.85 7.67, 0.89 7.63, 0.83 7.56, 0.84 7.64, 1.06
1990 7.39, 0.81 7.55, 0.84 7.53, 0.83 7.46, 0.83 7.50, 0.88
2011 7.39, 0.89 7.37, 0.86 No data 7.34, 0.84 7.38, 0.88
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