Table 4 Related factors and characteristics of malocclusion compared with normal occlusion
Normal | Malocclusion | P | |
|---|---|---|---|
(n = 191) | (n = 312) | ||
Boy ratio | 51.8% | 51.0% | n.s. |
Incompetent lip seal | 19.9% | 32.7% | < 0.01 |
Severe incompetent lip seal | 8.9% | 19.9% | < 0.001 |
Nail biting | 23.6% | 16.0% | < 0.05 |
Finger sucking | 5.2% | 9.3% | n.s.† |
Lip sucking or lip biting | 2.1% | 3.5% | n.s.† |
Chin resting on a hand | 4.2% | 3.5% | n.s.† |
Nasal obstruction | 25.1% | 32.7% | n.s. |
Allergic rhinitis | 17.3% | 17.0% | n.s. |
Palatine tonsil hypertrophy | 1.0% | 5.1% | < 0.05† |
Mandibular midline deviation | 35.1% | 43.6% | n.s. |
Unspaced dentitions | 23.6% | 38.8% | < 0.001 |