TABLE 1.
Demographics and Sleep Variables by Sleep Group
| A: Demographic Variables | ||||
|---|---|---|---|---|
| Good Sleeper Mean (SD) | Insomnia Mean (SD) | T/χ2 Test Statistic | p-value | |
| Age, years | 35.7 (7.8) | 40 (7.7) | −2.25 | 0.028 |
| Weight, kg | 70.2 (14) | 73.8 (18.2) | −0.76 | 0.452 |
| BMI, kg/m2 | 24.3 (4.7) | 26 (5.1) | −1.19 | 0.240 |
| Gender, N (%) | 9 (27.3) | 15 (45.5) | 2.36 | 0.125 |
| B: Sleep Variables | ||||
|---|---|---|---|---|
| Good Sleeper Mean (SE)1 | Insomnia, Mean (SE)1 | T Test Statistic | p-value | |
| Sleep Latency, minutes | 24.4 (2.0) | 47.1 (3.2) | 6.04 | <0.001 |
| Wake After Sleep Onset, minutes | 7.7 (1.1) | 32.8 (3.4) | 6.96 | <0.001 |
| Time in Bed, hours | 8.4 (0.1) | 8.5 (0.1) | 0.36 | 0.727 |
| Total Sleep Time, hours | 7.6 (0.1) | 6.5 (0.1) | −6.88 | <0.001 |
| Sleep Efficiency | 89.3 (0.5) | 76.4 (1.3) | −9.22 | <0.001 |
| C: Sleep Types and Bouts per Subject | ||||
|---|---|---|---|---|
| Good Sleeper Mean (SD) | Insomnia, Mean (SD) | T Test Statistic | p-value | |
| Total Nights Assessed | 102.8 (17.1) | 100.9 (21.8) | 0.39 | 0.698 |
| Number of Poor Nights | 7.4 (7.0) | 39 (25.5) | −6.86 | <0.001 |
| Number of Average Nights | 12.0 (10.7) | 24.3 (12.4) | −4.33 | <0.001 |
| Number of Good Nights | 83.3 (19.7) | 37.5 (23.8) | 8.52 | <0.001 |
| Number of Bouts | 12.4 (7.4) | 17.5 (8.1) | −2.69 | 0.009 |
| Number of Missing Nights | 7.2 (17.1) | 9.1 (21.8) | −0.39 | 0.698 |
| Censored Bouts | 0.5 (0.7) | 1.6 (0.8) | −5.90 | <0.001 |
| Mean Bout Duration2 | 1.4 (0.7) | 3.9 (4.6) | −2.99 | 0.004 |
| Median Bout Duration Length2 | 1.2 (0.4) | 3.1 (4.2) | −2.64 | 0.010 |
1
Estimates from linear regression models with sandwich estimator for variances
2
Number of poor or average nights between two good nights