| N | Cronbach’s α | Scale statistics | Inter-item correlations | Item total correlation | ||||
---|---|---|---|---|---|---|---|---|---|
 |  |  | M | SD | M | Min | Max | Min | Max |
12–14 years |  |  | |||||||
 Dental Self-Confidence | 202a | 0.83 | 15.99 | 5.56 | 0.45 | 0.33 | 0.62 | 0.48 | 0.72 |
 Social Impact | 202a | 0.83 | 18.54 | 6.56 | 0.38 | 0.17 | 0.55 | 0.41 | 0.66 |
 Psychological Impact | 202a | 0.79 | 16.44 | 5.25 | 0.39 | 0.23 | 0.57 | 0.42 | 0.65 |
 Aesthetic Concern | 203 | 0.52 | 4.58 | 3.58 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 |
15–17 years |  |  | |||||||
 Dental Self-Confidence | 190 | 0.84 | 15.21 | 5.29 | 0.47 | 0.36 | 0.64 | 0.53 | 0.73 |
 Social Impact | 189a | 0.86 | 19.63 | 6.78 | 0.43 | 0.27 | 0.60 | 0.47 | 0.68 |
 Psychological Impact | 189a | 0.83 | 17.11 | 5.56 | 0.46 | 0.32 | 0.69 | 0.49 | 0.76 |
 Aesthetic Concern | 190 | 0.62 | 4.74 | 3.30 | 0.45 | 0.45 | 0.45 | 0.45 | 0.45 |
12–17 years |  |  | |||||||
 Dental Self-Confidence | 392a | 0.84 | 15.57 | 5.44 | 0.46 | 0.36 | 0.63 | 0.54 | 0.70 |
 Social Impact | 391a | 0.85 | 19.07 | 6.69 | 0.41 | 0.25 | 0.51 | 0.48 | 0.65 |
 Psychological Impact | 391a | 0.81 | 16.76 | 5.41 | 0.43 | 0.29 | 0.63 | 0.45 | 0.70 |
 Aesthetic Concern | 393 | 0.56 | 4.66 | 1.86 | 0.47 | 0.40 | 0.55 | 0.48 | 0.60 |