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Table 3 Results of intention-to-treat analysis of outcomes by group

From: Knee arthroscopy and exercise versus exercise only for chronic patellofemoral pain syndrome: a randomized controlled trial

  Arthroscopy group Control group  
  At baseline 9-month follow-up At baseline 9-month follow-up Difference in mean change scores (95% CI)1,2
Kujala score, mean (SD) 69.0 (10.7) 81.9 (14.1) 71.1 (13.0) 82.5 (15.3) 1.1 (-7.4 to 5.2)
Pain when descending stairs, VAS mean (SD) 43.4 (27.2) 21.1 (23.0) 35.0 (26.9) 18.0 (23.3) 0.9 (-10.1 to 11.9)
Pain when ascending stairs, VAS mean (SD) 48.8 (29.9) 20.9 (24.7) 41.1 (29.4) 20.5 (24.9) 2.6 (-10.0 to 15.2)
Pain when standing up from a sitting position, VAS mean (SD) 39.0 (28.1) 16.6 (22.4) 41.4 (28.7) 21.8 (25.3) 4.1 (-7.0 to 15.2)
  1. 1The difference is positive, when the mean change in score was greater for arthroscopy than for control group.
  2. 2Adjusted for baseline values.