Three weeks of self-treatment with the Kyrobak reduced pain levels significantly in the IT group compared with the WLC group { mean [ standard deviation ( SD ) ] NRS score from baseline to post-treatment : IT group , 1.4 ( 1.5 ) , 95 % confidence interval ( CI ) 0.5 to 2.3 ; WLC group , -0.1 ( 2.2 ) , 95 % CI -1.1 to 1.2 ; effect mean difference 1.5 } .