Table 1 Descriptive statistics of oral health status of participants
|  | 12 years old | 15 years old | 18 years old | |||
|---|---|---|---|---|---|---|
N | Percentage | N | Percentage | N | Percentage | |
IOTN (DHC) treatment need | ||||||
 No need | 321 | 54.50% | 194 | 53.30% | 161 | 53.67% |
 Borderline need | 106 | 18.00% | 78 | 21.43% | 63 | 21.00% |
 Definite need | 162 | 27.50% | 92 | 25.27% | 76 | 25.33% |
IOTN (AC) treatment need | ||||||
 No need | 469 | 79.63% | 290 | 79.67% | 241 | 80.33% |
 Borderline need | 89 | 15.11% | 50 | 13.74% | 38 | 12.67% |
 Definite need | 31 | 5.26% | 24 | 6.59% | 21 | 7.00% |
DAI severity and treatment need | ||||||
 Normal or minor malocclusion-no treatment need or slight need | 312 | 52.97% | 153 | 42.03% | 129 | 43.00% |
 Definite malocclusion-treatment selective | 143 | 24.28% | 111 | 30.49% | 92 | 30.67% |
 Severe malocclusion-treatment highly desirable | 87 | 14.77% | 65 | 17.86% | 45 | 15.00% |
 Very severe (handicapping) malocclusion-treatment mandatory | 47 | 7.98% | 35 | 9.62% | 34 | 11.33% |
ICON treatment need | ||||||
 No | 383 | 65.03% | 241 | 66.21% | 197 | 65.67% |
 Yes | 206 | 34.97% | 123 | 33.79% | 103 | 34.33% |
ICON complexity | ||||||
 Easy | 173 | 29.37% | 103 | 28.30% | 89 | 29.67% |
 Mild | 292 | 49.58% | 188 | 51.65% | 147 | 49.00% |
 Moderate | 67 | 11.38% | 34 | 9.34% | 29 | 9.67% |
 Difficult | 33 | 5.60% | 21 | 5.77% | 22 | 7.33% |
 Very difficult | 24 | 4.07% | 18 | 4.95% | 13 | 4.33% |
PAR | ||||||
 Almost ideal occlusion | 122 | 20.71% | 69 | 18.96% | 71 | 23.67% |
 Acceptable occlusion | 254 | 43.12% | 119 | 32.69% | 91 | 30.33% |
 Malocclusion | 213 | 36.16% | 176 | 48.35% | 138 | 46.00% |
Periodontal status | ||||||
 CPI score = 0 | 80 | 13.58% | 27 | 7.42% | 16 | 5.33% |
 CPI score > 0 | 509 | 86.42% | 337 | 92.58% | 284 | 94.67% |
Caries experience | ||||||
  < SiC Index value | 499 | 84.72% | 317 | 87.09% | 257 | 85.67% |
  > =SiC Index value | 90 | 15.28% | 47 | 12.91% | 43 | 14.33% |
 DMFT = 0 | 403 | 68.42% | 172 | 47.25% | 123 | 41.00% |
 DMFT> 0 | 186 | 31.58% | 192 | 52.75% | 177 | 59.00% |
DMFT | Â | Mean (SD) | Â | Mean (SD) | Â | Mean (SD) |
| Â | 589 | 0.57 (1.024) | 364 | 1.70 (2.377) | 300 | 1.92 (2.373) |