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Table 4 Repeated measures test for three measurements (baseline, 10 min, and 30 min)

From: Evaluation of different doses of transcutaneous nerve stimulation for pain relief during labour: a randomized controlled trial

Group (A) Time (B) Time Differences (A – B) p* Difference (95% CI)
TENS 1 1a 2b 0.810 0.029 0.063 to 1.556
  3c 0.667 0.135 − 0.136 to 1.469
2 1 −0.810 0.029 −1.556 to −0.063
  2 −0.143 1.000 −0.637 to 0.351
3 1 −0.667 0.135 −1.469 to 0.136
  2 0.143 1.000 −0.351 to 0.637
TENS 2 1 2 −1.857 >  0.001 1.111 to 2.603
  3 2.238 >  0.001 1.436 to 3.040
2 1 −1.857 >  0.001 −2.603 to − 1.111
  2 0.381 0.187 −0.113 to 0.875
3 1 −2.238 >  0.001 −3.040 to −1.436
  2 −0.381 0.187 −0.875 to 0.113
Placebo 1 2 −1.762 >  0.001 −2.508 to − 1.016
  3 −2.190 >  0.001 −2.993 to −1.388
2 1 1.762 >  0.001 1.016 to 2.508
  2 −0.429 0.110 −0.922 to 0.065
3 1 2.190 >  0.001 1.388 to 2.993
  2 0.429 0.110 −0.065 to 0.922
  1. Data are visual analogue scale mean
  2. TENS transcutaneous electrical nerve stimulation, CI confidence interval
  3. *p values obtained from repeated measures test
  4. aBaseline
  5. bAfter 10 min
  6. cAfter 30 min