| Total | All subjects | p-value¶ | Males | p-value¶ | Females | p-value¶ | ||||
| Apnoeic | Normal | Apnoeic | Normal | Apnoeic | Normal | |||||
| Subjects n | 107# | 52# | 55 | 24 | 27 | 28 | 28 | |||
| Skeletal type | ||||||||||
| Class I | 60 (56) | 31 (59) | 29 (53) | 0.67 | 14 (58) | 13 (48) | 0.55 | 17 (61) | 16 (57) | 0.96 |
| Class II | 34 (32) | 16 (31) | 18 (33) | 8 (33) | 9 (33) | 8 (28) | 9 (32) | |||
| Class III | 13 (12) | 5 (10) | 8 (14) | 2 (9) | 5 (19) | 3 (11) | 3 (11) | |||
Data are presented as n (%), unless otherwise stated. #: sella–nasion–subspinale, sella–nasion–supramentale and subspinale–nasion–supramentale angles were not obtained in three subjects due to artefacts on midsagittal magnetic resonance imaging; ¶: Chi-squared test.