Table 4 Daytime sleepiness and quality of life questionnaires according to obstructive sleep apnea severity
|  | AHI < 15 | 15 ≤ AHI < 30 | AHI > 30 | p value | p value* |
|---|---|---|---|---|---|
Daytime sleepiness | |||||
 ESS | 7.5 (4.3) | 8.5 (5.3) | 10.6 (5.3) | 0.01 | 0.08 |
 ESS ≥ 11, % | 22.8 | 37.5 | 46.0 | 0.06 | – |
Quality of life | |||||
 SF36 PCS | 50.4 (2.3) | 50.6 (2.5) | 51.0 (2.2) | 0.51 | – |
 SF36 MCS | 48.1 (5.9) | 47.0 (6.5) | 45.4 (6.4) | 0.12 | – |
 SF36 bodily pain | 60.4 (24.7) | 60.9 (29.2) | 54.1 (26.0) | 0.41 | – |
 SF36 energy/vitality | 57.1 (20.8) | 52.1 (25.9) | 43.0 (23.8) | 0.02 | 0.02 |
 SF36 general health | 65.6 (21.8) | 62.3 (18.2) | 56.2 (22.0) | 0.11 | – |
 SF36 mental health | 67.6 (20.3) | 63.5 (23.1) | 57.8 (22.0) | 0.09 | – |
 SF36 physical functioning | 72.3 (25.8) | 65.4 (27.3) | 62.5 (28.3) | 0.24 |  |
 SF36 role emotional | 82.1 (34.1) | 76.0 (35.4) | 65.1 (42.0) | 0.10 | – |
 SF36 role physical | 83.3 (30.5) | 66.0 (40.1) | 58.0 (40.7) | 0.007 | 0.01 |
 SF36 social functioning | 75.5 (28.7) | 76.6 (25.7) | 61.6 (31.1) | 0.03 | 0.04 |