Table 5 Validity assessments: Spearman’s rank correlations between selected variables and GOHAI-ADD scores
Type of validity | Â | Group A | Group B | ||||
|---|---|---|---|---|---|---|---|
Variable | Answer categories | n | Mean GOHAI-ADD score (SD) | Correlation (r), p-value | n | Mean GOHAI-ADD score (SD) | Correlation (r), p-value |
Convergent validity | |||||||
Perceived oral health | |||||||
 Very bad | 0 | - | r = 0.42 | 2 | 31.50 (7.78) | r = 0.68 | |
 Bad | 1 | 31.00 (-) | p <0.001 | 13 | 44.46 (6.67) | p <0.001 | |
 Moderate | 23 | 46.39 (8.47) |  | 23 | 49.30 (5.66) |  | |
 Good | 83 | 53.48 (6.13) |  | 53 | 53.64 (4.19) |  | |
 Very good | 2 | 59.00 (0.00) |  | 26 | 57.81 (2.58) |  | |
Satisfied with oral health | |||||||
 Yes | 93 | 53.63 (6.00) | r = 0.47 | 84 | 54.71 (4.54) | r = 0.52 | |
 No | 15 | 41.73 (7.75) | p <0.001 | 34 | 46.32 (7.24) | p <0.001 | |
Discriminant validity | |||||||
Perceived general health | |||||||
 Very bad | NA | NA | r = 0.24 | 3 | 52.00 (8.54) | r = 0.10 | |
 Bad | 1 | 59.00 (-) | p = 0.014 | 24 | 51.21 (7.66) | p = 0.30 | |
 Moderate | 21 | 47.62 (9.46) |  | 38 | 52.05 (6.32) |  | |
 Good | 74 | 52.45 (6.88) |  | 49 | 52.88 (6.54) |  | |
 Very good | 11 | 55.64 (4.99) |  | 4 | 54.25 (4.27) |  | |
Clinical treatment need | |||||||
 Yes | 40 | 48.80 (8.56) | r = 0.29 | 65 | 50.52 (6.36) | r = 0.36 | |
 No | 69 | 53.67 (6.24) | p = 0.002 | 53 | 54.47 (6.34) | p = <0.001 | |
At least one tooth with cariesa | |||||||
 Yes | 7 | 51.86 (6.09) | r = 0.08 | 32 | 50.66 (5.88) | r = 0.42 | |
 No | 59 | 53.15 (6.00) | p = 0.55 | 26 | 55.15 (5.53) | p = 0.001 | |
Known-group validity | |||||||
Dental/ prosthodontic status | |||||||
 Natural teeth without RDP | 44 | 54.36 (4.62) | r = 0.29 | 24 | 53.67 (6.29) | r = 0.07 | |
 Natural teeth with RDP | 22 | 50.68 (7.42) | p = 0.003 | 34 | 51.94 (5.97) | p = 0.44 | |
 No natural teeth | 43 | 49.12 (8.84) |  | 60 | 51.95 (7.13) |  | |
no. of natural teetha (1-32) | 66 |  | r = 0.39 | 58 |  | r = 0.24 | |
|  |  |  | p <0.001 |  |  | p = 0.067 | |
Perceived need for treatment | |||||||
 Yes | 45 | 48.11 (8.24) | r = 0.48 | 33 | 46.33 (7.50) | r = 0.53 | |
 No | 63 | 54.79 (5.31) | p <0.001 | 85 | 54.61 (4.51) | p <0.001 | |
Other correlations | |||||||
Gender | |||||||
 Female | 52 | 50.33 (8.01) | r = 0.17 | 68 | 52.40 (6.76) | r = 0.01 | |
 Male | 57 | 53.30 (6.80) | p = 0.08 | 50 | 52.16 (6.50) | p = 0.88 | |
age | (65–100) |  |  | r = 0.09 |  |  | r = 0.09 |
|  |  |  |  | p = 0.34 |  |  | p = 0.36 |
SES | high | 34 | 53.00 (5.96) | r = -0.18 | 28 | 54.21 (5.42) | r = -0.14 |
|  | middle | 54 | 51.39 (7.72) | p = 0.07 | 47 | 52.11 (7.27) | p = 0.13 |
| Â | low | 19 | 48.79 (8.66) | Â | 42 | 51.33 (6.53) | Â |