Table 2.
Polysomnography Results by Age Group
| Age group, y |
p value | Posthoc | ||||||
|---|---|---|---|---|---|---|---|---|
| 2-3.9 | 4-5.9 | 6-7.9 | 8-9.9 | 10-11.9 | 12-18 | |||
| TST, min | 430.4 ± 53.6 | 427.0 ± 44.6 | 424.5 ± 54.0 | 428.5 ± 44.5 | 429.4 ± 54.4 | 332.3 ± 66.8 | < 0.001 | 1–5 > 6 |
| Sleep stage, % | ||||||||
| 1 | 4.6 ± 2.5 | 3.6 ± 2.3 | 4.0 ± 3.2 | 4.0 ± 3.3 | 3.9 ± 2.8 | 5.5 ± 4.4 | 0.128 | |
| 2 | 43.7 ± 5.6 | 44.1 ± 5.9 | 43.6 ± 7.2 | 43.6 ± 7.3 | 46.2 ± 6.7 | 53.8 ± 7.1 | < 0.001 | 1–5 < 6 |
| SWS | 29.9 ± 6.2 | 30.4 ± 5.9 | 31.4 ± 7.8 | 30.9 ± 4.1 | 30.2 ± 6.7 | 24.1 ± 7.7 | < 0.001 | 1–5 > 6 |
| REM | 22.0 ± 4.9 | 22.1 ± 4.2 | 20.5 ± 5.3 | 21.1 ± 5.0 | 19.7 ± 4.7 | 16.5 ± 4.3 | < 0.001 | 1–4 > 6 |
| REM latency, min | 97.6 ± 48.5 | 110.2 ± 58.5 | 109.7 ± 54.3 | 112.8 ± 52.6 | 113.2 (57.4) | 156.4 ± 94.5 | 0.002 | 1 < 6 |
| AHIa | 4.8 ± 9.7 | 3.4 ± 8.7 | 5.4 ± 9.4 | 3.1 ± 4.7 | 4.2 ± 6.6 | 14.3 ± 34.3 | 0.890 | |
| OAHIb | 1.5 ± 2.4 | 1.9 ± 7.4 | 2.3 ± 4.3 | 1.0 ± 2.2 | 2.1 ± 5.3 | 11.9 ± 32.6 | 0.311 | |
| CAHIa | 3.3 ± 8.4 | 1.4 ± 2.0 | 3.1 ± 5.8 | 2.1 ± 3.9 | 2.0 ± 3.7 | 2.4 ± 3.4 | 0.657 | |
| OSAS | 13 (38.2) | 11 (25.0) | 19 (38.0) | 6 (15.8) | 6 (20.0) | 13 (34.2) | 0.126 | |
| RAIa | 2.7 ± 2.5 | 1.9 ± 2.9 | 3.7 ± 6.8 | 2.5 ± 3.5 | 2.5 ± 4.3 | 10.2 ± 27.3 | 0.394 | |
| SAI | 9.4 ± 5.0 | 8.4 ± 3.7 | 9.0 ± 5.8 | 8.8 ± 4.9 | 8.9 ± 5.5 | 13.2 ± 7.6 | 0.002 | 2,4 < 6 |
| Sao2nadir | 90.8 ± 6.0 | 91.5 ± 4.3 | 90.9 ± 4.3 | 92.0 ± 3.0 | 90.5 ± 6.5 | 90.5 ± 6.6 | 0.781 | |
Data are presented as mean ± SD or number (%). For posthoc results 1 = 2- to 3.9-y age group, 2 = 4- to 5.6-y age group, 3 = 6- to 7.9-y age group, 4 = 8- to 9.9-y age group, 5 = 10- to 11.9-y age group, 6 = 12- to 18-y age group (adolescents). TST refers to total sleep time; SWS, slow wave sleep; OAHI, obstructive apnea and hypopnea index; CAHI, central apnea and hypopnea index; OSAS, obstructive sleep apnea syndrome; RAI, respiratory arousal index; SAI, spontaneous arousal index.
a
Analysis conducted using transformed values; untransformed mean ± SD values are presented in the table.
b
Analysis conducted using median test due to extreme skew; mean ± SD values are presented in the table.