The WOMAC pain scores showed greater improvement in the active treatment group than in control at weeks 3 ( P = 0.012 ) , 6 ( P < 0.001 ) , 12 ( P = 0.002 ) , and 24 ( P = 0.002 ) as did WOMAC physical function scores of the active treatment group at week 3 ( P = 0.002 ) , 6 ( P = 0.015 ) , and 12 ( P < 0.001 ) but not 24 ( P = 0.058 ) .