Table 1. Descriptive statistics.
| Blue light group n = 12 |
Amber light group n = 18 |
Statistic | |
|---|---|---|---|
| Age | 21.50 (3.34) | 22.11 (4.07) | t(28) = .42 |
| Sex | 50% female | 61% female | χ2(1) = .36 |
| Sleep duration the night before (in hours) | 6.87 (.71) | 6.88 (.90) | t(28) = .05 |
| Habitual bedtime | 11:33pm (66 min) | 11::16pm (55 min) | t(28) = -.70 |
| Habitual waketime | 8:07am (54 min) | 7:20am (60 min) | t(28) = -2.15* |
| Habitual sleep duration (in hours) | 7.54 (.78) | 7.33 (1.02) | t(28) = -.59 |
| Number of caffeinated products | 1 | 3 | χ2(1) = .43 |
| WASI-FSQI | 104.75 (12.82) | 106.61 (11.50) | t(28) = .68 |
| WASI-FSQI Vocabulary Subscale | 54.28 (8.92) | 54.75(9.62) | t(28) = -.14 |
| BDI-II | 1.75 (2.00) | 2.94 (3.40) | t(28) = 1.01 |
| CVLT-II Trial 1 standard score | 0.42 (.86) | .28 (1.25) | t(28) = .57 |
| CVLT-II Trial 5 standard score | .45 (.97) | .00 (.91) | t(28) = -1.29 |
| CVLT Trial 1–5 standard score | 55.83 (8.89) | 56.39 (8.75) | t(28) = .16 |
WASI-FSQI: Wechsler Abbreviated Scale of Intelligence Full Scale-II; BDI-II: Beck Depression Inventory; CVLT-II: California Verbal Learning Test
*p <.05