Table 1.
Participant demographics and sleep variables from 1 wk of actigraphy in the week prior to the laboratory visit
| Demographics | Room light condition | Dim light condition | p |
|---|---|---|---|
| Number | 10 | 10 | |
| Age (years) | 26.61 ± 4.34 | 26.78 ± 5.15 | 0.89a |
| BMI (kg/m2) | 23.25 ± 3.94 | 24.25 ± 3.71 | 0.39a |
| Sex (females, n) | 8 | 6 | 0.16c |
| Race | 6 White, 3 Asian, 1 African-American | 4 White, 5 Asian, 1 African-American | 0.24c |
| Actigraphy measures | |||
| Bedtime (hh:mm) | 23:05 ± 0:36 | 23:02 ± 0:37 | 0.96a |
| Sleep duration (hh:mm) | 7:13 ± 0:40 | 7:00 ± 0:27 | 0.46a |
| SE (%) | 88.07 ± 3.10 | 84.08 ± 6.21 | 0.09c |
SE = sleep efficiency. (a) two-sided Student’s t test; (b) nonparametric two-sided Wilcoxon rank-sum test; (c) χ2 test.