Table 4 Content validity index of item relevancy and clarity, and Modified Kappa agreement of the Thumb Disability Exam (TDX)
Item | Relevance | Clarity | Interpretation | ||||||
|---|---|---|---|---|---|---|---|---|---|
Agreement | I-CVI* | Pc** | K*** | Agreement | I-CVI* | Pc** | K*** | Â | |
A. Please indicate your ability to perform these activities with the affected hand | |||||||||
 Turn a Key | 54/61 | 0.89 | <  10 − 5 | 0.89 | 51/53 | 0.96 | <  10 − 5 | 0.96 | Excellent |
 Pick up a coin | 52/61 | 0.85 | <  10 − 5 | 0.85 | 49/51 | 0.96 | <  10 − 5 | 0.96 | Excellent |
 Write | 56/61 | 0.92 | <  10 − 5 | 0.92 | 51/54 | 0.94 | <  10 −5 | 0.94 | Excellent |
 Squeeze toothpaste | 52/60 | 0.87 | <  10 −5 | 0.87 | 51/53 | 0.96 | <  10 −5 | 0.96 | Excellent |
 Hold a glass of water | 50/61 | 0.82 | <  10 − 5 | 0.82 | 51/54 | 0.94 | <  10 − 5 | 0.94 | Excellent |
 Turn a doorknob | 52/61 | 0.85 | <  10 − 5 | 0.85 | 51/53 | 0.96 | <  10 − 5 | 0.96 |  |
 Use a knife to cut food | 54/61 | 0.89 | <  10 −5 | 0.89 | 51/53 | 0.96 | <  10 −5 | 0.96 | Excellent |
B. Please indicate your ability to perform the following task while using both your hands | |||||||||
 Open a jar | 57/61 | 0.93 | <  10 −5 | 0.93 | 50/51 | 0.98 | <  10 −5 | 0.98 | Excellent |
 Button a shirt/blouse | 53/61 | 0.87 | <  10 −5 | 0.87 | 49/50 | 0.98 | <  10 −5 | 0.98 | Excellent |
 Tie your shoes | 55/61 | 0.90 | <  10 −5 | 0.90 | 50/51 | 0.98 | <  10 −5 | 0.98 | Excellent |
 Wring a dishcloth/washcloth | 53/61 | 0.87 | <  10 −5 | 0.87 | 49/51 | 0.96 | <  10 −5 | 0.96 | Excellent |
II. The following questions refer to the level of pain in your thumb | |||||||||
 How often did you have pain in your thumb at rest? | 50/61 | 0.82 | <  10 −5 | 0.82 | 40/52 | 0.77 | <  10 −5 | 0.77 | Excellent |
 How often did the pain in your thumb interfere with your daily activities? | 49/60 | 0.82 | <  10 −5 | 0.82 | 44/51 | 0.86 | <  10 −5 | 0.86 | Excellent |
 How often did the pain in your hand interfere with recreational activities? | 51/60 | 0.85 | <  10 −5 | 0.85 | 44/52 | 0.85 | <  10 −5 | 0.85 | Excellent |
 How often did the pain in your thumb interfere with your sleep? | 47/60 | 0.78 | <  10 −5 | 0.78 | 44/52 | 0.85 | <  10 −5 | 0.85 | Excellent |
 How often did the pain in your thumb worsen your mood? | 51/60 | 0.85 | <  10 −5 | 0.85 | 42/52 | 0.81 | <  10 −5 | 0.81 | Excellent |
III. The following questions ask about your satisfaction with the indicated hand or thumb over the past week. | |||||||||
 Motion in your affected thumb | 48/58 | 0.83 | <  10 −5 | 0.83 | 47/53 | 0.89 | <  10 −5 | 0.89 | Excellent |
 Strength of your affected hand | 54/57 | 0.95 | <  10 −5 | 0.95 | 48/53 | 0.91 | <  10 −5 | 0.91 | Excellent |
 Pain level of your affected hand | 52/58 | 0.90 | <  10 −5 | 0.90 | 48/53 | 0.91 | <  10 −5 | 0.91 | Excellent |
 Overall function of your hand | 53/58 | 0.91 | <  10 −5 | 0.91 | 46/52 | 0.88 | <  10 −5 | 0.88 | Excellent |
S-CVI | 0.87 (95% CI: 0.85to 0.89) | Â | 0.91 (95% CI: 0.89to 0.94) | Â | Â | ||||