Three weeks of self-treatment with the Kyrobak reduced pain levels significantly in the IT group compared with the WLC group -LCB- mean -LSB- standard deviation ( SD ) -RSB- NRS score from baseline to post-treatment : IT group , @ ( @ ) , @ % confidence interval ( CI ) @ to @ ; WLC group , -@ ( @ ) , @ % CI -@ to @ ; effect mean difference @ -RCB- .