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Table 2 Comparison of scores from the 5-, 10-, and 15-item OA-FUNCTION-CATs and the full item bank

From: A functional difficulty and functional pain instrument for hip and knee osteoarthritis

  Total (n = 328) Both hip and knee (n = 89) Hip (n = 53) Knee (n = 186)
Version Mean (SD) Range Mean (SD) Range Mean (SD) Range Mean (SD) Range
Difficulty         
   5-CAT 49.7 (10.7) 23.7–82.3 47.2 (9.4) 31.6–79 52.3 (11.2) 35.8–82.3 50.1 (11) 23.9–82.3
   10-CAT 50.1 (10.9) 23.7–91.2 47.6 (9.5) 31–88.6 53.4 (11.5) 37.9–91.2 50.4 (11.2) 23.7–91.2
   15-CAT 50.4 (11.2) 22.7–95.6 47.8 (9.8) 30.2–91.8 53.8 (11.8) 37.4–95.6 50.6 (11.4) 22.7–95.6
   Full item bank 50.4 (10.8) 24.2–96.7 47.6 (9.6) 28.5–95.8 54.1 (9.7) 37.5–75.7 50.7 (11.3) 24.2–96.7
Pain         
   5-CAT 49.9 (10.7) 24.5–84.6 47.4 (8.9) 31.1–74.8 53.7 (11.9) 34.6–76.9 49.9 (10.8) 24.5–84.6
   10-CAT 50.5 (11.5) 25.8–98.4 47.6 (8.6) 31.7–66.1 55.2 (13.1) 37.2–87.6 50.6 (11.8) 25.8–98.4
   15-CAT 50.6 (11.8) 26.2–107.3 47.5 (8.6) 32.8–67.8 55.3 (13.3) 36.2–87.1 50.7 (12.3) 26.2–107.3
   Full item bank 50.7 (11.9) 25–112.9 47.4 (8.2) 32.2–72.6 55.3 (12.5) 36.9–90.8 50.9 (12.7) 25–112.9
  1. CAT, computer adaptive test; OA, osteoarthritis; SD, standard deviation.