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Table 3 Sleep length and debt, wellbeing and circadian preference by affection status.

From: Seasonal changes, sleep length and circadian preference among twins with bipolar disorder

  Bipolar disorder No mental disorder
  n mean 95% CI n mean 95% CI
FTCQ       
sleep length (h)       
in 1975 21 7.86 7.61 to 8.11 9 7.83 7.56 to 8.11
in 1981 22 7.77 7.38 to 8.17 12 7.79 7.28 to 8.31
in 1990 18 7.92 7.48 to 8.35 10 7.15 6.81 to 7.49
sleep debt (h)       
in 1981 22 -0.34 -0.74 to 0.06 12 0.04 -0.24 to 0.33
in 1990 18 -0.25 -0.85 to 0.35 10 0 -0.24 to 0.24
SPAQ       
GSS 39 8.21 6.82 to 9.59 20 5.20 3.49 to 6.91
GWS 37 2.43 0.52 to 4.34 19 1.32 -0.05 to 2.68
MES 21 53.29 50.2 to 59.2 11 54.64 50.2 to 59.1
  1. Abbreviations: FTCQ = The Finnish Twin Cohort Questionnaire, SPAQ = The Seasonal Pattern Assessment Questionnaire, GSS = Global Seasonality Score, GWS = Global Weather Score, MES = Morningness-Eveningness Score.