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 |