Table 2.

Postoperative pain scores (visual analogue scale score)

Time (h)	Group S (n=41)	Group T (n=41)	Group C (n=41)	P for overall group effecta	P for group S versus group Cb	P for group T versus group Cb	P for group S versus group Tb
1	2.7 [2.2, 3.2]	2.9 [2.5, 3.5]	4.1 [3.7, 4.6]	<0.0001	<0.0001	0.003	0.996
2	2.6 [2.2, 3.0]	2.5 [2.0, 3.0]	3.6 [3.2, 4.0]	<0.0001	0.001	<0.0001	0.989
4	2.5 [2.2, 2.8]	2.2 [1.8, 2.7]	3.2 [2.7, 3.8]	0.002	0.006	0.008	0.976
6	2.3 [1.9, 2.8]	2.2 [1.7, 2.6]	3.3 [2.8, 3.9]	0.001	0.010	0.003	0.967
24	2.1 [1.7, 2.6]	2.3 [1.9, 2.6]	2.5 [2.0, 2.9]	0.547	0.831	0.962	1.0
48	1.9 [1.6, 2.2]	1.7 [1.4, 1.9]	1.9 [1.6, 2.2]	0.456	0.892	0.973	0.836

Notes: Values are expressed as the mean [95% confidence interval]. ^aThe P-value for the overall group effect is set at 0.05. ^bP-values less than 0.0167 were considered to indicate significant difference between three groups, according to the Bonferroni method.

Abbreviations: Group C, intravenous patient-controlled analgesia; group S, intravenous patient-controlled analgesia + serratus anterior plane block; group T, intravenous patient-controlled analgesia + thoracic paravertebral block.