The measurement properties of the CPQ11–14-ISF-16; the CPQ11–14-ISF-8; the CPQ11–14-RSF-16 and the CPQ11–14-RSF-8 were evaluated using the data from the validity and reliability studies for the long-form CPQ11–14 [1 (link)]. Scores for all short forms were calculated by summing the response codes to their questions. Criterion validity, construct validity and internal consistency reliability were assessed based on the responses from 123 children. Clinical data were obtained for 26 of the paediatric dentistry group, 45 of the group with malocclusions and all 39 of the oro-facial group and used for further assessments of construct validity. Sixty-five of the 123 children, who completed the CPQ11–14 again after a period of two weeks and who did not report change in either their oral health or its impact on their overall well-being at the follow-up, provided the data for the assessment of test-retest reliability.
For criterion validity, positive high correlations between the long-form and each short-form questionnaire were expected. For discriminant construct validity, the hypothesis that the scores are highest in the oro-facial, lower in the orthodontic and lowest in the paediatric dentistry group was tested. It was also hypothesized that within each of the three groups scores would be highest for those with the most severe clinical condition. For correlational construct validity, positive correlations between the scores and children's global ratings of oral health and well-being were tested. Since the former is a measure of health and the latter a measure of health-related quality of life, it was predicted that the correlation coefficient would be higher for the rating of well-being than for the rating of oral health.
Relative validity (RV) estimates were computed as the ratios of F statistics for the short-form questionnaires and the original CPQ11–14. They indicate in proportional terms how much more or less precise a short-form questionnaire is in relation to the original CPQ11–14 [16 (link),17 (link)].
Internal consistency reliability was determined determined using Cronbach's alpha. Alphas were also calculated with each item deleted. Corrected item total correlations were also compared. Test-retest reliability was assessed using the intraclass correlation coefficient (ICC). This was calculated using a one-way analysis of variance random effects parallel model [18 (link),19 (link)].
For criterion validity, positive high correlations between the long-form and each short-form questionnaire were expected. For discriminant construct validity, the hypothesis that the scores are highest in the oro-facial, lower in the orthodontic and lowest in the paediatric dentistry group was tested. It was also hypothesized that within each of the three groups scores would be highest for those with the most severe clinical condition. For correlational construct validity, positive correlations between the scores and children's global ratings of oral health and well-being were tested. Since the former is a measure of health and the latter a measure of health-related quality of life, it was predicted that the correlation coefficient would be higher for the rating of well-being than for the rating of oral health.
Relative validity (RV) estimates were computed as the ratios of F statistics for the short-form questionnaires and the original CPQ11–14. They indicate in proportional terms how much more or less precise a short-form questionnaire is in relation to the original CPQ11–14 [16 (link),17 (link)].
Internal consistency reliability was determined determined using Cronbach's alpha. Alphas were also calculated with each item deleted. Corrected item total correlations were also compared. Test-retest reliability was assessed using the intraclass correlation coefficient (ICC). This was calculated using a one-way analysis of variance random effects parallel model [18 (link),19 (link)].
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