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Table 2 Content validity index of item relevancy and clarity, and Modified Kappa agreement of the Australian and Canadian Osteoarthritis Index (AUSCAN)

From: Evaluation of the content validity index of the Australian/Canadian osteoarthritis hand index, the patient-rated wrist/hand evaluation and the thumb disability exam in people with hand arthritis

Item Relevance Clarity Interpretation
Agreement I-CVI* Pc** K*** Agreement I-CVI* Pc** K***  
Rate your pain
 At rest 49/57 0.86 <  10 −5 0.86 49/50 0.98 <  10 − 5 0.98 Excellent
 Gripping 55/57 0.96 <  10 − 5 0.96 49/49 1.00 <  10 −5 1.00 Excellent
 Lifting 55/57 0.96 <  10 −5 0.96 49/50 0.98 <  10 −5 0.98 Excellent
 Turning 54/57 0.95 <  10 −5 0.95 46/50 0.92 <  10 −5 0.92 Excellent
 Squeezing 55/57 0.96 <  10 −5 0.96 50/50 1.00 <  10 −5 1.00 Excellent
Rate your stiffness
 After first wakening in the morning 52/56 0.93 <  10 −5 0.93 48/48 1.00 <  10 − 5 1.00 Excellent
Rate your difficulty when
 Turning taps/faucets on 51/58 0.88 <  10 −5 0.88 51/51 1.00 <  10 −5 1.00 Excellent
 Turning a round doorknob or handle 54/59 0.92 <  10 −5 0.92 53/53 1.00 <  10 − 5 1.00 Excellent
 Doing up buttons 52/59 0.88 <  10 −5 0.88 52/52 1.00 <  10 −5 1.00 Excellent
 Fastening jewellery 52/59 0.88 <  10 − 5 0.88 53/53 1.00 <  10 − 5 1.00 Excellent
 Opening a new jar 57/59 0.97 <  10 −5 0.97 53/53 1.00 <  10 − 5 1.00 Excellent
 Carrying a full pot with one hand 56/59 0.95 <  10 − 5 0.95 52/53 0.98 <  10 −5 0.98 Excellent
 Peeling vegetables/fruits 56/59 0.95 <  10 −5 0.95 53/53 1.00 <  10 −5 1.00 Excellent
 Picking up large heavy objects 55/59 0.93 <  10 − 5 0.93 51/51 1.00 <  10 − 5 1.00 Excellent
 Wringing out wash cloths 52/59 0.88 <  10 − 5 0.88 50/51 0.98 <  10 −5 0.98 Excellent
S - CVI 0.92 (95% CI: 0.90 to 0.94)   0.99 (95% CI: 0.98 to 1.00)   
  1. NOTE: *I-CVI: item-level content validity index, **pc (probability of a chance occurrence) was computed using the formula: pc = [N! /A! (N -A)!] *.5N where N = number of raters and A = number of raters who agree that the item is relevant or clear, ***K (Modified Kappa) was computed using the formula: K = (I-CVI- PC)/(1- PC). Interpretation criteria for Kappa, using guidelines described in Cicchetti and Sparrow (1981): Fair = K of 0.40 to 0.59; Good = K of 0.60 to 0.74; and Excellent = K > 0.74. I-CVI, item-level content validity index; scale-level content validity index, average (S-CVI/Ave)