Table 2. Prevalence of age group, sex and main characteristics in mouthbreather and nose-breather groups.
| Variable | Groups | |||
|---|---|---|---|---|
| Nose-breather | Mouth-breather | |||
| n | % | n | % | |
| Age (years) | ||||
| 6 - 7 | 102 | 19.6 | 32 | 19.2 |
| 8 - 9 | 218 | 41.9 | 77 | 46.1 |
| 10 - 11 | 183 | 35.2 | 48 | 28.7 |
| 12 | 17 | 3.3 | 10 | 6 |
| Sex | ||||
| Male | 236 | 45.4 | 90 | 53.9 |
| Female | 284 | 54.6 | 77 | 46.1 |
| Lip seal | ||||
| Present | 507 | 97.5* | 107 | 64.1 |
| Absent | 13 | 2.5 | 60 | 35.9* |
| Facial type | ||||
| Mesofacial | 404 | 77.7* | 100 | 60.5 |
| Dolichofacial | 61 | 11.7 | 58 | 34.7* |
| Brachyfacial | 55 | 10.6* | 8 | 4.8 |
| Open bite | ||||
| Absent | 437 | 84.1* | 128 | 76.6 |
| Top | 40 | 7.7 | 18 | 10.8 |
| Present | 43 | 8.2 | 21 | 12.6 |
| Palate | ||||
| Normal | 328 | 63.1* | 77 | 46.1 |
| Atresic | 192 | 36.9 | 90 | 53.9* |
| Total | 520 | 100 | 167 | 100 |
*
statistically significant (p < 0.050).