Efficacy and Safety of Acupuncture for Acute Low Back Pain in Emergency Department: A Pilot Cohort Study

Table 2

Comparison between groups of VAS before, after, and 3 days after intervention.

	Control ()				Acupuncture ()				value^b
	Median			value^a	Median			value^a
VAS-1	5.5	4	7		7.0	5	8		0.059
VAS-2	4.5	4	6	0.109	4.0	2	5	<0.001^∗	0.161
VAS-3	3.0	0	4	0.011^∗	3.0	1	6	<0.001^∗	0.465

value^a by Wilcoxon Signed Ranks Test (take VAS1 as reference) (intergroup).
value^b by Mann-Whitney test (between groups).
: Percentile 25.
: Percentile 75.
VAS-1, VAS before intervention; VAS-2, VAS after intervention; VAS-3, VAS of 3 days after intervention.
Statistically significant difference ().