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Table 4 Sensitivity, specificity and odds ratios (OR) of the screening questionnaire for knee or hip osteoarthritis by gender and age

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

   Sensitivity,% (95% CI) Specificity,% (95% CI) OR (95% CI)
Hip Total 87.37% (85.03, 89.71) 59.76% (56.11, 63.41) 10.27 (7.43, 14.19)
Men: < 70 86.11% (78.12, 94.10) 67.65% (61.71, 73.59) 12.96 (6.30, 26.66)
  70–79 83.02% (72.91, 93.13) 62.86% (54.86, 70.86) 8.27 (3.74, 18.32)
  ≥ 80 75.00% (50.50, 99.50) 73.33% (50.95, 95.71) 8.25 (1.45, 46.86)
Women: < 70 89.68% (84.37, 94.99) 54.46% (49.60, 59.32) 10.39 (5.67, 19.06)
  70–79 90.82% (85.10, 96.54) 57.26% (50.92, 63.60) 13.29 (6.37, 27.58)
  ≥ 80 81.48% (66.83, 96.13) 64.44% (50.45, 78.43) 7.98 (2.54, 25.11)
Knee Total 94.54% (93.21, 95.87) 43.20% (38.00, 48.40) 13.17 (9.29, 18.65)
Men: < 70 95.83% (92.25, 99.41) 42.11% (35.09, 49.13) 16.73 (6.53, 42.85)
  70–79 95.24% (91.17, 99.31) 45.45% (35.05, 55.85) 16.67 (6.18, 44.91)
  ≥ 80 93.33% (80.70, 100)* 16.67% (0, 37.76)* 2.80 (0.22, 35.29)
Women: < 70 92.51% (89.35, 95.67) 45.63% (39.61, 51.65) 10.36 (6.18, 44.91)
  70–79 96.43% (93.83, 99.03) 40.44% (32.19, 48.69) 18.33 (8.01, 41.98)
  ≥ 80 93.75% (86.90, 100)* 45.83% (25.90, 65.76) 12.69 (3.07, 52.40)
  1. 95% CI = 95% confidence interval. *Lower and upper limits have been set up to 0 and 100 when they were negative or greater than 100, respectively.