Table 2.
Comparison of polysomnography findings between groups.
| Healthy Control (n = 32) Mean ± SD |
OSA (Pre-AT) (n = 55) Mean ± SD |
OSA (Post-AT) (n = 55) Mean ± SD |
p 1 Value (Post-AT vs. Pre-AT) |
p 2 Value (Post-AT vs. Control) |
|
|---|---|---|---|---|---|
| AHI > 1 (events/h, n, %) | 0 (0%) | 55 (100%) | 34 (61.8%) | <0.001 * | <0.001 * |
| AHI (events/h) | 0.46 ± 0.28 | 15.71 ± 22.60 | 2.98 ± 4.35 | <0.001 * | <0.001 * |
| AHI/REM (events/h) | 1.28 ± 1.49 | 24.75 ± 30.45 | 5.74 ± 7.52 | <0.001 * | <0.001 * |
| AI (events/h) | 0.16 ± 0.18 | 4.60 ± 8.80 | 1.25 ± 3.04 | 0.006 * | <0.001 * |
| HI | 0.39 ± 0.41 | 11.98 ± 16.20 | 2.33 ± 4.01 | <0.001 * | 0.001 * |
| ODI (events/h) | 0.41 ± 0.24 | 13.52 ± 19.14 | 3.08 ± 3.82 | <0.001 * | <0.001 * |
| Sleep efficiency (%) | 89.90 ± 6.10 | 84.51 ± 11.77 | 88.83 ± 7.85 | 0.025 * | 0.494 |
| Awake (%) | 6.15 ± 5.13 | 9.16 ± 11.60 | 7.26 ± 7.67 | 0.335 | 0.446 |
| Arousal Index(events/h) | 6.74 ± 3.26 | 15.83 ± 16.58 | 8.78 ± 6.63 | 0.006 * | 0.066 |
| REM (%) | 18.70 ± 5.44 | 18.04 ± 5.11 | 21.00 ± 5.70 | 0.006 * | 0.073 |
| Stage N1 (%) | 10.55 ± 6.64 | 10.45 ± 10.86 | 7.30 ± 4.31 | 0.060 | 0.016 |
| Stage N2 (%) | 43.17 ± 9.68 | 39.29 ± 11.09 | 40.00 ± 9.61 | 0.706 | 0.152 |
| Stage N3 (%) | 23.46 ± 12.74 | 31.82 ± 12.56 | 31.27 ± 7.96 | 0.435 | 0.040 * |
| TST (mins) | 399.40 ± 42.34 | 382.74 ± 52.22 | 401.81 ± 21.63 | 0.009 * | <0.001 * |
| Sleep latency(mins) | 17.90 ± 15.99 | 25.10 ± 19.96 | 14.66 ± 11.42 | 0.001 * | 0.324 |
| PLMI (events/h) | 0.29 ± 0.28 | 0.54 ± 1.48 | 1.23 ± 4.13 | 0.164 | 0.135 |
| SI (events/h) | 36.26 ± 57.69 | 208.06 ± 225.2 | 111.36 ± 166.4 | 0.008 * | 0.006 * |
| Mean SaO2 (%) | 96.77 ± 3.77 | 96.40 ± 2.80 | 97.45 ± 1.06 | 0.010 * | 0.094 |
| Mean heart rate | 77.35 ± 13.79 | 84.68 ± 11.64 | 78.17 ± 9.74 | <0.001 * | 0.773 |
* p < 0.05 (P1: pair T test of post- and pre-AT; P2: independent T test of post-AT and normal controls). SD: standard deviation; Pre-AT: before adenotonsillectomy. Post-AT: half a year after adenotonsillectomy; AHI: apnea hypopnea index; AHI/REM: AHI during REM; AI: apnea index; HI: hypopnea index; ODI: Oxygen Desaturation Index; REM: rapid eye movement; TIB: Time in Bed; SPT: Sleep Period Time; TST: Total Sleep Time; WASO: Wake time after sleep onset; PLMI: Periodic Limb Movement Index; SI: Snore Index; Mean SaO2: mean oxygen saturation.