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Table 3: Degree of overbite
| Age | Normal | Increased | Edge-to-edge | Anterior open bite | Total | ||||||
| 3 years | 253 (64.2%) | 137 (34.8%) | 4 (1.0%) | 0 | 394 (100%) | ||||||
| 4 years | 201 (71.3%) | 80 (28.4%) | 0 | 1 (0.4%) | 282 (100%) | ||||||
| 5 years | 89 (67.4%) | 39 (29.5%) | 3 (2.3%) | 1 (0.8%) | 132 (100%) | ||||||
| Total | 543 (67.2%) | 256 (31.7%) | 7 (0.9%) | 2 (0.2%) | 808 (100%) |
χ2 = 11.626, p = 0.071 (not significant)
