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Table 3 Rate of response and association of responses to individual questions about hip OA with symptomatic hip osteoarthritis (n = 1464)

From: Validation of a screening questionnaire for hip and knee osteoarthritis in old people

Question n Frequency of positive findings,% Sensitivity,% (95% CI) Specificity,% (95% CI) Positive Predictive Value,% (95% CI) Negative Predictive Value,% (95% CI) Odds ratio (95% CI) C statistics
1. – During the last 12 months, have you often had pain in one or both your hips for one month or more? 1316 56.69 87.09 (83.65, 90.53) 54.94 (51.78, 58.10) 42.49 (38.94, 46.04) 91.75 (89.49, 94.01) 8.22 (5.90, 11.46) 0.712
2. – Has a doctor ever told you that you have osteoarthritis in one or both of your hips? 1357 40.01 66.67 (61.92, 71.42) 70.28 (67.42, 73.14) 46.41 (42.22, 50.60) 84.52 (82.04, 87.00) 4.73 (3.67, 6.10) 0.685
3. – Do you have a prosthesis in one or both of your hips? 1362 4.92 16.04 (12.32, 19.76) 99.29 (98.77, 99.81) 89.55 (82.23, 96.87) 75.75 (73.42, 78.08) 26.78 (12.12, 59.19) 0.577
4. – Have you ever had any surgical intervention in one or both of your hips? 1366 3.07 8.22 (5.45, 10.99) 98.89 (98.24, 99.54) 73.81 (60.50, 87.12) 73.87 (71.50, 76.24) 7.97 (3.96, 16.02) 0.536
5. – During the last 12 months, have you had stiffness in one or both of your hips for one month or more? 1352 28.48 47.03 (41.94, 52.12) 78.51 (75.94, 81.08) 45.19 (40.22, 50.16) 79.73 (77.20, 82.26) 3.24 (2.51, 4.18) 0.628
6. – During the last 12 months, have you had any of the following limitations because of pain or stiffness in one or both of your hips?         
   6.a. – Rising from a chair or toilet. 1331 45.98 69.92 (65.24, 74.60) 63.20 (60.15, 66.25) 42.16 (38.25, 46.07) 84.56 (81.92, 87.20) 3.99 (3.08, 5.17) 0.666
   6 b. – Putting on your stockings or shoes. 1336 47.68 72.85 (68.33, 77.37) 62.03 (58.97, 65.09) 42.54 (38.70, 46.38) 85.55 (82.94, 88.16) 4.38 (3.37, 5.70) 0.674
   6 c. – Walking 4 blocks (or 500 m) 1326 42.76 69.11 (64.40, 73.82) 67.40 (64.43, 70.37) 44.97 (40.88, 49.06) 84.98 (82.44, 87.52) 4.62 (3.57, 5.99) 0.683
  1. 95% CI = 95% confidence interval
  2. c statistics: estimated by logistic regression model