Table 2.
Average Nightly Sleep Duration by Different Measures for 2 Weeks Preceding a Multiple Sleep Latency Test
| Group | Sleep duration |
p Value | ||
|---|---|---|---|---|
| Self-reporteda | Sleep logb | Actigraphyc | ||
| > 8 | 4 (7) | 5 (10) | 1 (2) | |
| 7–7.9 | 14 (26) | 20 (40) | 8 (15) | |
| 6–6.9 | 18 (33) | 18 (36) | 13 (25) | |
| 5–5.9 | 14 (26) | 7 (14) | 13 (25) | |
| < 5 | 4 (7) | 0 (0) | 17 (33) | |
| Mean, h | 6.13 ± 1.23 | 6.99 ± 0.85 | 5.56 ± 1.50 | < 0.0001 |
Data are presented as number (%) of patients in each group, based on number of hours of sleep, except mean, which is the mean ± SD number of hours of sleep for the total population.
a
Self-reported average nightly sleep is the patient's response to the question “How many hours of sleep do you get on average per night?”
b
Data extracted from patient sleep logs.
c
Actigraphy-measured sleep per Cole-Kripke scoring algorithm.