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| Side effects | Nasal mask | Oral mask |
| at one month (scale 1 worst ‐5 best) | mean +/‐ SD | mean +/‐ SD |
| Oral dryness | 4.1 +/‐ 0.9 | 3.3 +/‐ 0.9 |
| Nasal dryness | 4.4 +/‐ 0.9 | 4.9 +/‐ 0.39 |
| Nasal congestion | 3.6 +/‐ 1.2 | 4.8 +/‐ 0.5 |
| Gum pain | 4.7 +/‐ 1.0 | 4.3 +/‐ 0.8 |
| Air leaks | 3.9 +/‐ 1.1 | 4.6 +/‐ 0.8 |
