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Fig. 3. Intergroup comparisons of mean and night-time visual analogue scale (VAS) scores. Asterisk (*) indicates statistically significant differences between the time points within the group. For the lines in a box and whisker plot: error bars are the 95% confidence interval, the bottom and top of the box are the 25th and 75th percentiles, the line inside the box is the 50th percentile (median), and any outliers are shown as open circles or asteriks. TENS: transcutaneous electrical nerve stimulation, bTENS: burst TENS, cTENS: conventional TENS, pTENS: placebo TENS, preT: before treatment, postT: after treatment, postT3: third month after treatment.
Korean J Pain 2021;34:217~228
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