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Polysomnographic features of the groups 2 (FVC < 75% with NPPV) and 3 (FVC < 75% without NPPV)
| FVC < 75% | Group 2 (16) (NPPV) | Group 3 (12) (no NPPV) | p-value |
| SpO2 per min, (% ± SD) | 89 ± 5.2 | 88 ± 7.4 | ns |
| Total sleep time, min, (mean ± SD) | 312 ± 54 | 306 ± 62 | ns |
| AHI median (range ± SD) | 12 ± 7 | 11 ± 8 | ns |
| AI/h | 7 ± 1,38 | 3.8 ± 6,5 | ns |
| HI/h | 17 ± 5,61 | 19 ± 1.5 | ns |
Data are presented as mean (± SD); ns = not significant
