Table 3.
Distribution of Sleep Architecture Variables for Children With Down Syndrome by Age.a
| Variables | 1–2 y (n = 47) | 3–5 y (n = 274) | 6–9 y (n = 52) | ≥10 y (n = 24) | P valueb |
|---|---|---|---|---|---|
| Sleep | |||||
| Efficiency, % | 81 (9) | 83 (11) | 83 (9) | 74 (17) | .002 |
| Latency, min | 27.5 (35.3) | 29.3 (33.6) | 27 (32) | 46.9 (57.5) | .37c |
| Median [IQR] | 14.0 [4.5–36.5] | 19.4 [5–39.9] | 16.5 [4.8–38.5] | 24.8 [12.6–55.5] | |
| Total time, min | |||||
| Sleep | 426.0 (62.5) | 430.1 (73.3) | 426.6 (61.2) | 378.2 (115.6) | .01d |
| In bed | 525.9 (61) | 523.0 (59.6) | 518.8 (50) | 505.5 (80.8) | .53 |
| REM | |||||
| Cycles | 6.8 (1.9) | 5 (1.6) | 4.4 (1.4) | 3.3 (1.5) | <.0001 |
| Latency, min | 67.8 (33) | 130.0 (60.3) | 143.8 (69) | 171.2 (101.1) | <.0001 |
| Time spent, % | |||||
| Supine | 48 (33) | 43 (27) | 40 (25) | 65 (30) | .0009d |
| Prone | 36 (31) | 30 (25) | 32 (26) | 21 (24) | .40 |
| Side | 34 (21) | 35 (20) | 39 (21) | 31 (23) | .46 |
Abbreviations: IQR, interquartile range; REM, rapid eye movement.
a
Values are presented as mean (SD) unless noted otherwise.
b
P value reported from analysis of variance comparing 4 age groups.
c
Kruskal-Wallis test reported.
d
Significant differences between ≥ 10 years and other age groups. No differences across 3 younger groups.