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Table 1 Profile of 15-year-old participants

From: The factors that influence oral health-related quality of life in 15-year-old children

  Female Male Total P
  N Percentage N Percentage N Percentage
IOTN (DHC) treatment need
 No need 88 47.3% 106 59.6% 194 53.3% 0.052
 Borderline need 48 25.8% 30 16.9% 78 21.4%
 Definite need 50 26.9% 42 23.6% 92 25.3%
IOTN (AC) treatment need
 No need 148 79.6% 142 79.8% 290 79.7% 0.850
 Borderline need 23 12.4% 27 15.2% 50 13.7%
 Definite need 15 8.1% 9 5.1% 24 6.6%
DAI severity and treatment need
 Normal or minor malocclusion-no treatment need or slight need 78 41.9% 75 42.1% 153 42.0% 0.877
 Definite malocclusion-treatment selective 55 29.6% 56 31.5% 111 30.5%
 Severe malocclusion-treatment highly desirable 36 19.4% 29 16.3% 65 17.9%
 Very severe (handicapping) malocclusion-treatment mandatory 17 9.1% 18 10.1% 35 9.6%
ICON treatment need
 No 117 62.9% 124 69.7% 241 66.2% 0.173
 Yes 69 37.1% 54 30.3% 123 33.8%
ICON complexity
 Easy 52 28.0% 51 28.7% 103 28.3% 0.730
 Mild 95 51.1% 93 52.2% 188 51.6%
 Moderate 19 10.2% 15 8.4% 34 9.3%
 Difficult 9 4.8% 12 6.7% 21 5.8%
 Very difficult 11 5.9% 7 3.9% 18 4.9%
PAR
 Almost ideal occlusion 37 19.9% 32 18.0% 69 19.0% 0.428
 Acceptable occlusion 53 28.5% 66 37.1% 119 32.7%
 Malocclusion 96 51.6% 80 44.9% 176 48.4%
Periodontal status
 CPI score = 0 17 9.1% 10 5.6% 27 7.4% 0.201
 CPI score > 0 169 90.9% 168 94.4% 337 92.6%
 CPI score < 2 35 18.8% 26 14.6% 61 16.8% 0.283
 CPI score = 2 151 81.2% 152 85.4% 303 83.2%
Caries experience
 < SiC Index value 158 84.9% 159 89.3% 317 87.1% 0.214
 > =SiC Index value 28 15.1% 19 10.7% 47 12.9%
 DMFT = 0 76 40.9% 96 53.9% 172 47.3% 0.013*
 DMFT> 0 110 59.1% 82 46.1% 192 52.7%
DMFT   Mean(SD)   Mean(SD)   Mean(SD)  
  186 2.01 (2.57) 178 1.38 (2.12) 364 1.70 (2.38) 0.012*
  1. P: comparison for DMFT used the independent samples t test; others used the Mann-Whitney U test
  2. IOTN index of orthodontic treatment need, DHC dental health component, AC aesthetic component, ICON index of complexity, outcome and need, PAR peer assessment rating, CPI community periodontal index, DMFT decayed, missing and filled teeth, SiC Index significant caries index; SiC index value (SD) was 4.48 (2.24)
  3. *: P < 0.05, **P < 0.01