Table 1.
Multivariable hazard ratios* (95% CI) derived from proportional hazards regression modeling of the average and individual nap latencies and the Epworth Sleepiness Scale (ESS)
| ESS Quartile | Average MSLT | Individual Naps by Start Time |
P-value† | |||
|---|---|---|---|---|---|---|
| 09:00 | 11:00 | 13:00 | 15:00 | |||
| I (0–9) | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | — |
| II (10–13) | 1.32 (1.06–1.64) | 1.15 (0.93–1.44) | 1.18 (0.94–1.47) | 1.28 (1.03–1.61) | 1.35 (1.06–1.73) | 0.24 |
| III (14–17) | 1.85 (1.48–2.31) | 1.43 (1.15–1.79) | 1.60 (1.28–2.01) | 1.45 (1.16–1.82) | 1.99 (1.56–2.55) | < 0.08 |
| IV (≥ 18) | 2.54 (2.01–3.19) | 1.69 (1.34–2.12) | 1.81 (1.44–2.29) | 2.26 (1.79–2.85) | 2.56 (1.99–3.29) | < 0.001 |
*
Hazard ratios are adjusted for age, sex, race, marital status, education, and BMI.
†
P-value for the test for trend for the hazard ratio across naps for each ESS quartile.