At followup , mean group differences in the change from baseline were 3.1 kPa ( 95 % confidence interval [ 95 % CI ] 0.2 , 6.0 ; P = 0.038 ) for the PPT , 2,608 mm seconds ( 95 % CI 458 , 4,758 ; P = 0.019 ) for TS , and 6.8 points ( 95 % CI 1.2 , 12.4 ; P = 0.018 ) for KOOS pain , all in favor of ET .