| Variables | Presence of gingival overgrowth (n) | p | |
|---|---|---|---|
| Yes | No | ||
| Sex | |||
| Girls | 55 | 70 | 0.035 |
| Boys | 41 | 27 | |
| Age | |||
| 9–13 | 11 | 3 | 0.18 |
| 13–19 | 56 | 39 | |
| > 20 | 29 | 55 | |
| Ethnicity | |||
| Caucasian | 50 | 54 | 0.56 |
| Maghreb | 34 | 29 | |
| African | 12 | 12 | |
| Asian people | 0 | 2 | |
| General health problem | |||
| None | 81 | 86 | 0.41 |
| Not related to oral health | 8 | 4 | |
| Related to oral health | 8 | 6 | |
| Mouth breathing | |||
| Yes | 82 | 71 | 0.04 |
| No | 14 | 26 | |
| Presence of plaque | |||
| None | 5 | 19 | 0.004 |
| Little | 31 | 36 | |
| Visible | 47 | 37 | |
| Large amount | 13 | 5 | |
| Frequence of brushing | |||
| At least twice a day | 87 | 89 | 0.89 |
| Once a day or less | 9 | 8 | |
| Periodontal phenotype | |||
| Thick | 36 | 23 | 0.043 |
| Thin | 60 | 74 | |
| Type of bracket | |||
| Metal | 90 | 80 | 0.021 |
| Ceramic | 6 | 17 | |
| Orthodontic arch | |||
| With nickel | 26 | 35 | 0.18 |
| Without nickel | 70 | 62 | |
| Type of ligature | |||
| Elastomerics | 63 | 45 | 0.0071 |
| Metal or self-ligating | 33 | 52 | |
| Duration of treatment | |||
| Less than 1 year | 53 | 42 | 0.022 |
| Between 1 and 2 years | 47 | 20 | |
| More than 2 years | 25 | 6 | |