Table 3.

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

	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

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.