Development and validation of an occlusal cant index

BMC Oral Health

Table 7 Content validity of the OCI

^aI-CVI (item-level content validity index) = number of experts providing a rating of 3 or 4 / number of experts
^bPc (probability of chance occurrence) = [N/A * (N - A)] × 0.5^N, N = number of experts; A = number of experts providing a rating of 3 or 4
^cκ*(modified kappa) = (I-CVI-Pc)(1-Pc)
^dEvaluation criteria for the level of content validity: relationship between I-CVI and k*; excellent validity = I-CVI ≥ 0.78 and k* > 0.74 (****); good validity I-CVI < 0.78 and ≥ 0.60 and k* ≤ 0.74 (***); fair validity I-CVI < 0.6 and ≥ 0.40 and k* ≤ 0.59 (**); and poor validity I-CVI < 0.4 and κ* < 0.40 (*)
^eS−CVI/Ave (scale−level content validity index based on the average agreement among experts) = sum of the I−CVI / number of items

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