Figure 3.

Effects of 14 days of percutaneous peripheral nerve stimulation on pain. Pain severity is indicated using a numeric rating scale (Panels A and B) the Defense and Veterans Pain Rating Scale (Panel C) with 0 equal to no pain and 10 being the worst imaginable pain. For scores during the initial 7 postoperative days, P values were estimated from repeated measures linear mixed effects model with an autoregressive correlation structure, adjusting for baseline scores and imbalanced surgical location; for postoperative day 11 and 15, P values were estimated from Wilcoxon rank sum test stratified by surgical location; for month 1, P values were estimated from multivariable linear regression models adjusting for baseline scores and surgical location. Data expressed as median (dark horizontal bars) with 25^th–75^th (box), 10^th–90^th (whiskers), mean (diamonds), and outliers (circles).