. 2018 Nov 26;19:652. doi: 10.1186/s13063-018-3036-2

Table 3.

Adjustment of baseline pain level differences using the ANCOVA method

Group	Mean	error*	Difference (95% CI)
TENS 1	6.514^a	0.300	5.913 to 7.115
TENS 2	5.382^a	0.315	4.750 to 6.013
Placebo	9.200^a	0.308	8.583 to 9.816

Data are visual analogue scale (VAS) mean values

TENS transcutaneous electrical nerve stimulation, CI confidence interval

*error values obtained from ANCOVA method

^aThe covariates that appear in the model are evaluated with the following values: pain VAS at baseline = 7269. The dependent variable is VAS after 30 min