On the WOMAC Index , however , statistically significant differences were found for pain reduction between the intervention and control group ( mean difference 7.4 points , 95 % CI 3.0-11 .8 , p = 0.001 ) and between the intervention and placebo group ( mean difference 5.1 points , 95 % CI 0.7-9 .4 , p = 0.024 ) .