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Age-group-wise comparison of severity of gingivitis (PMA index); Chi-square value = 16.6, df = 3, p = 0.001 (p < 0.05, significant)
| Age-groups (year) | Normal n (%) | Mild n (%) | Moderate n (%) | Severe n (%) | Total n (%) |
|---|---|---|---|---|---|
| 6–8 | 217 (41.8%) | 192 (37%) | 101 (19.5%) | 9 (1.73%) | 519 (100%) |
| 9–12 | 159 (29.9%) | 235 (44.3%) | 122 (23%) | 15 (2.8%) | 531 (100%) |
| Total | 376 (35.8%) | 427 (40.7%) | 223 (21.2%) | 24 (2.28%) | 1,050 (100%) |
