Table. 7.

Intra- and intergroup comparison of preT and postT3 SSR values

SSR values bTENS (n = 25) cTENS (n = 25) pTENS (n = 23) P valuea
Upper extremity
Latency (ms)
preT 1.4 ± 0.2 1.4 (1.2-1.8) 1.3 ± 0.2 1.3 (0.9-1.6) 1.3 ± 0.2 1.4 (0.8-1.8) 0.913
postT3 1.4 ± 0.2 1.4 (0.7-1.8) 1.3 ± 0.1 1.3 (0.9-1.6) 1.4 ± 0.1 1.4 (1.2-1.5)
P valueb 0.993 0.542 0.821
Amplitude (mV)
preT 2.7 ± 2.6 2.0 (0.8-10.9) 2.9 ± 1.7 1.7 (0.8-7.4) 2.7 ± 1.6 2.4 (0.4-5.2) 0.660
postT3 2.7 ± 1.9 1.9 (0.9-8.0) 2.8 ± 1.4 2.6 (1.2-4.9) 3.6 ± 2.1 3.0 (1.2-8.4)
P valuec 0.937 0.575 0.508
Lower extremity
Latency (ms)
preT 2.1 ± 0.3 2.0 (1.7-2.7) 1.7 ± 0.2 1.8 (1.2-2.0) 1.8 ± 0.3 1.9 (1.1-2.1) 0.903
postT3 1.9 ± 0.4 1.8 (1.2-2.6) 1.7 ± 0.2 1.7 (1.2-2.1) 1.6 ± 0.2 1.7 (1.2-2.0)
P valuec 0.367 0.484 0.314
Amplitude (mV)
preT 0.9 ± 0.4 0.8 (0.3-1.7) 1.1 ± 0.6 1.0 (0.3-2.0) 1.5 ± 1.3 0.9 (0.4-4.8) 0.275
postT3 2.0 ± 1.6 1.3 (0.5-5.9) 1.2 ± 0.9 0.8 (0.4-2.9) 2.3 ± 1.4 1.8 (0.8-4.9)
P valuec 0.016 0.575 0.037

Values are presented as mean ± standard deviation or median (minimum-maximum).

preT: before treatment, postT3: third month after treatment, SSR: sympathetic skin response, ms: millisecond, mV: millivolt, TENS: transcutaneous electrical nerve stimulation, bTENS: burst TENS, cTENS: conventional TENS, pTENS: placebo TENS.

aANOVA. bt-test. cWilcoxon test.

Korean J Pain 2021;34:217~228 https://doi.org/10.3344/kjp.2021.34.2.217
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