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Table 4 Sleep length in the morning and evening types by affection status.

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

Sleep length (h) Bipolar disorder No mental disorder
  n mean 95% CI n mean 95% CI
Morning type       
in 1981 from FTCQ 6 7.58 6.62 to 8.55 6 7.67 6.53 to 8.80
in 1999 from SPAQ 9 8.72 7.76 to 9.69 6 7.25 6.63 to 7.87
Evening type       
in 1981 from FTCQ 10 7.70 7.06 to 8.34 6 7.92 7.40 to 8.43
in 1999 from SPAQ 12 7.77 6.99 to 8.56 6 7.38 6.28 to 8.47