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Distribution of orthodontic the complexity according to ICON for age groups
| Complexity grade* | Score | 13 years | 14 years | 15 years | Total |
|---|---|---|---|---|---|
| Easy | <29 | 66 (%33) | 74 (%37) | 64 (%32) | 204 (%34) |
| Mild | 29-50 | 54 (%27) | 46 (%23) | 46 (%23) | 146 (%24.33) |
| Moderate | 51-63 | 52 (%26) | 48 (%24) | 42 (%21) | 142 (%23.66) |
| Difficult | 64-77 | 18 (%9) | 22 (%11) | 30 (%15) | 70 (%11.66) |
| Very difficult | >77 | 10 (%5) | 10 (%5) | 18 (%9) | 38 (%6.33) |
| Total | 200 | 200 | 200 | 600 | |
Chi square test, p< 0.05
