For the OIDP performance scores, the inter-item correlation coefficients ranged between 0.02 (relationship between cleaning teeth and carrying out work) and 0.65 (relationship between eating, sleeping, and relaxing) ( Table 3 ). Construct validity of the instrument was demonstrated in that the mean OIDP scores showed a clear trend with OIDP scores; those with perceived 'dissatisfaction with general health', 'oral health ' and 'dental appearance' having higher OIDP score, indicating higher level of oral impacts (p<0.05) ( Table 4 ).
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