Home polysomnographic findings and parental ratings of child’s sleep quality impairment and daytime sleepiness: children with asthma at baseline (n = 21) compared with sex and age matched controls (n = 18)
| Children with asthma | Controls | p value | |
|---|---|---|---|
| Polysomnography | |||
| Actual sleep time (minutes) | 515.5 | 538.0 | NS |
| (453.5–566.8) | (465.4–586.5) | ||
| Sleep efficiency (%) | 93.8 | 98.0 | < 0.01 |
| (89.0–97.0) | (97.3–98.4) | ||
| Sleep latency (minutes) | 16.5 | 13.0 | NS |
| (11.8–19.6) | (10.5–16.0) | ||
| Number of awakenings < 2 minutes | 13 | 1 | < 0.01 |
| (8–17) | (0–2.5) | ||
| Number of awakenings > 2 minutes | 4 | 1 | < 0.01 |
| (2–7) | (0–2) | ||
| NREM stage 1 (%) | 5.9 | 4.8 | NS |
| (3.7–7.6) | (4.2–8.6) | ||
| NREM stage 2 (%) | 24.5 | 30.4 | NS |
| (18.2–31.7) | (22.7–33.6) | ||
| NREM stage 3 and 4 combined (slow wave sleep) (%) | 36.6 | 44.1 | NS |
| (30.3–54.6) | (33.8–55.3) | ||
| REM latency (minutes) | 100.5 | 113.0 | NS |
| (56.8–142.4) | (73.0–151.5) | ||
| REM sleep (%) | 21.5 | 20.0 | NS |
| (16.5–27.0) | (16.0–23.0) | ||
| Parental ratings | |||
| Impairment of sleep quality (%) | 33.0 | 0.0 | < 0.01 |
| (21.0–52.0) | (0.0–5.0) | ||
| Daytime sleepiness (%) | 19.0 | 14.0 | < 0.05 |
| (10.0–33.0) (2) | (5.0–19.0) (1) | ||
Results expressed as median (interquartile range) (any missing values).
NREM, non-rapid eye movement.