| Trial | Prefers NIV | Prefers alternative ACT | No preference | Total participants |
| Fauroux 1999 | 14 | 2 | 16 | |
| Holland 2003 | 15 | 8 | 3 | 26 |
| Kofler 1998 | 12 | 5 | 3 | 20 |
| Total | 41 | 13 | 8 | 62 |
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