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. 2002 Oct 5;325(7367):752. doi: 10.1136/bmj.325.7367.752

Table 2.

Change in WOMAC pain scores at 6, 12, 18 and 24 months and knee related physical function and stiffness at 24 months

Outcome
No of participants
Baseline
Mean difference at 24 months†
95% confidence interval for mean difference
df
F
P
Effect size
Primary
Knee pain at 24 months*:
 Exercise 467 7.15 −0.82 −1.3 to −0.3 1 and 779 11.14 0.001 0.25
 Non-exercise 316 7.35
 Telephone 393 7.10 −0.16 −0.6 to 0.3 1 and 779 0.45 0.50 0.05
 Non-telephone 390 7.40
Knee pain at 6 months:
 Exercise 467 7.15 −0.61 −1.0 to −0.2 1 and 779 8.64 0.003 0.21
 Non-exercise 316 7.35
Knee pain at 12 months:
 Exercise 467 7.15 −0.61 −1.0 to −0.2 1 and 779 7.80 0.005 0.20
 Non-exercise 316 7.35
Knee pain at 18 months:
 Exercise 467 7.15 −0.69 −1.1 to −0.2 1 and 779 9.10 0.003 0.22
 Non-exercise 316 7.35
Secondary
Physical function:
 Exercise 466 23.15 −2.57 −4.1 to −1.1 1 and 778 11.44 0.001 0.25
 Non-exercise 316 22.97
Stiffness:
 Exercise 470 3.42 −0.29 −0.5 to −0.1 1 and 782 6.44 0.01 0.18
 Non-exercise 316 3.46
*

Interaction of exercise and telephone (P=0.54). 

Negative values for mean differences reflect improvements in knee symptoms compared with baseline.