Table 2.

Pain condition at postoperative 24 hours (acute pain) and two months (short-term pain)

	Pecs group (n=22)	Serratus group (n=21)	P value
<primary outcome>
No pain (NRS=0): at 2 months	12 (55%)	4 (19%)
unadjusted odds ratio	5.10 (95% CI, 1.29–20.17)		0.03*
†adjusted odds ratio	5.04 (95% CI, 1.26–20.07)		0.02*
(ALND)	1.74 (95% CI, 0.35–8.66)		0.50
<secondary outcomes>
NRS score: at 2 months	0.5 [0.5, 1]	1 [1, 2]	0.03*
NRS score: at 24 hours	2 [1, 3]	3 [1.5, 3.5]	0.47
Morphine consumption (mg)	1.5 [0.75, 5.5]	3 [1.5, 10]	0.11

Values are median [interquartile range] or number (proportion). *significantly difference between Pecs group and Serratus group (P<0.05).

^†The adjusted odds ratio was evaluated by the multivariable logistic regression, adjusting for axillary lymph node dissection.

NRS, numerical rating scale; CI, confidence interval; ALND, axillary lymph node dissection.