TABLE 2.
POLYSOMNOGRAPHIC CHARACTERISTICS OF 103 CHILDREN WITH HABITUAL SNORING, 102 CHILDREN WITH OBSTRUCTIVE SLEEP APNEA, AND 73 CONTROL CHILDREN
| Snoring Children (n = 205)
|
p Value
|
|||||
|---|---|---|---|---|---|---|
| Group 1: Nonsnoring (n = 73) | Group 2: No OSA (n = 103) | Group 3: OSA (n = 102) | Group 1 vs. Group 2 | Group 1 vs. Group 3 | Group 2 vs. Group 3 | |
| Sleep latency, min | 22.8 ± 15.4 | 19.0 ± 13.6 | 13.5 ± 7.2 | NS | < 0.01 | < 0.04 |
| REM latency, min | 121.8 ± 32.5 | 122.6 ± 33.3 | 116.5 ± 38.1 | NS | NS | NS |
| Total sleep time, h | 8.4 ± 0.3 | 8.3 ± 0.3 | 8.4 ± 0.2 | NS | NS | NS |
| Sleep efficiency, % | 92.0 ± 6.2 | 90.6 ± 6.4 | 87.7 ± 6.5 | NS | NS | NS |
| Stage 1, % | 7.2 ± 4.1 | 8.1 ± 5.2 | 8.7 ± 5.3 | NS | NS | NS |
| Stage 2, % | 42.2 ± 6.7 | 46.1 ± 6.9 | 49.9 ± 5.6 | NS | < 0.01 | NS |
| Stage 3, % | 6.4 ± 1.6 | 5.2 ± 2.1 | 4.1 ± 1.8 | NS | < 0.01 | < 0.05 |
| Stage 4, % | 20.2 ± 5.5 | 17.3 ± 6.2 | 14.9 ± 5.9 | < 0.05 | < 0.01 | < 0.05 |
| Slow wave sleep, % | 24.1 ± 5.9 | 22.0 ± 6.4 | 19.6 ± 6.2 | NS | < 0.01 | < 0.05 |
| REM sleep, % | 23.6 ± 4.4 | 19.6 ± 5.8 | 17.7 ± 5.7 | < 0.05 | < 0.01 | NS |
| Spontaneous arousal index, /h TST | 7.6 ± 3.1 | 7.1 ± 4.2 | 4.4 ± 3.8 | NS | < 0.01 | < 0.05 |
| Respiratory arousal index, /h TST | 0.0 ± 0.0 | 1.9 ± 0.6 | 4.8 ± 1.0 | < 0.001 | < 0.0001 | < 0.001 |
| Total arousal index, /h TST | 7.6 ± 3.1 | 8.9 ± 3.7 | 9.2 ± 3.9 | < 0.05 | < 0.01 | NS |
| PLM index with arousal, /h TST | 0.2 ± 0.2 | 0.3 ± 0.2 | 0.3 ± 0.2 | NS | NS | NS |
| PLM index in sleep, /h TST | 1.1 ± 1.1 | 1.8 ± 1.2 | 2.0 ± 1.3 | NS | NS | NS |
| PLM index total, /h TST | 1.3 ± 1.4 | 2.1 ± 1.6 | 2.3 ± 1.5 | NS | NS | NS |
| AHI, /h TST | 0.0 ± 0.0 | 0.8 ± 0.2 | 8.9 ± 2.1 | < 0.0001 | < 0.00001 | < 0.0001 |
| AI, /h TST | 0.0 ± 0.0 | 0.2 ± 0.1 | 2.9 ± 0.4 | < 0.001 | < 0.00001 | < 0.0001 |
| Mean SpO2 | 97.8 ± 0.8 | 97.1 ± 1.1 | 96.5 ± 1.2 | NS | NS | NS |
| SpO2 nadir | 94.1 ± 0.2 | 90.4 ± 0.8 | 80.9 ± 2.1 | < 0.01 | < 0.00001 | < 0.0001 |
| % TST SpO2 < 90% | 0.0 ± 0.0 | 0.0 ± 0.0 | 2.5 ± 0.2 | NS | < 0.00001 | < 0.0001 |
| Mean PetCO2 | 41.9 ± 0.7 | 45.4 ± 1.2 | 48.1 ± 1.3 | < 0.01 | < 0.001 | < 0.01 |
| %TST PetCO2 > 50 mm Hg | 3.4 ± 0.1 | 14.2 ± 2.7 | 25.7 ± 3.9 | < 0.0001 | < 0.00001 | < 0.0001 |
Definition of abbreviations: AHI = apnea–hypopnea index; AI = apnea index; PetCO2 = end-tidal carbon dioxide level; PLM = periodic limb movement; SpO2 = oxygen saturation as measured by pulse oximetry; TST = total sleep time.