Table 5.
Proportion of students supragingival calculus score by district age and sex (N = 785) (percentages in parenthesis).
| Calculus-free | With calculus | Total | |||||
| n | % | n | % | n | % | ||
|
| |||||||
| District | Tanga | 145 | (42.9) | 249 | (55.7)*** | 394 | (50.2) |
| Lushoto | 193 | (57.1) | 198 | (44.3) | 391 | (49.8) | |
| Age group | 14–17 | 235 | (69.5) | 313 | (70.0) | 548 | (69.8) |
| (years) | 18+ | 103 | (30.5) | 134 | (30.0) | 237 | (30.2) |
| Sex | M | 154 | (45.6) | 236 | (52.8) | 390 | (49.7) |
| F | 184 | (54.4) | 211 | (47.8) | 395 | (50.3) | |
|
| |||||||
| Total | 338 | (43.1) | 447 | (56.9) | 785 | (100.0) | |
Chi-square test: ***P < 0.001.