Table 3.

Intraoperative IVP.

Time point	“U” type tension-reducing	Intermittent tension-reducing	Non- tension-reducing	Number of patients	p (between adjacent step)	p (among the three groups)
Preoperation	7.8 ± 4.4	8.3 ± 3.4	7.1 ± 3.5	7.7 ± 3.7		0.6275
After anesthesia	7.2 ± 3.8	7.2 ± 3.0	6.3 ± 3.4	6.8 ± 3.4	<0.001	0.6615
After cutting of the skin	7.6 ± 3.9	7.1 ± 3.2	6.4 ± 3.2	6.9 ± 3.4	0.1802	0.5429
After cutting of the subcutaneous tissue	7.6 ± 4.1	7.1 ± 3.1	6.4 ± 3.4	7.0 ± 3.5	0.4845	0.5592
After cutting of the rectus abdominis sheath	7.4 ± 3.8	7.1 ± 3.3	6.2 ± 3.3	6.9 ± 3.5	0.0735	0.4899
After cutting of the rectus abdominis guard	6.2 ± 3.3	6.1 ± 3.1	5.7 ± 3.0	6.0 ± 3.1	<0.001	0.8617
1 h after start of the operation	5.3 ± 3.6	5.6 ± 3.5	5.1 ± 2.8	5.3 ± 3.2	0.0216	0.9119
After closure of the rectus abdominis guard	6.7 ± 3.2	6.8 ± 2.9	7.2 ± 2.9	6.9 ± 3.0	<0.001	0.8559
After closure of the rectus abdominis sheath	6.9 ± 3.5	7.4 ± 2.7	7.5 ± 3.0	7.3 ± 3.0	0.002	0.8368
After closure of the subcutaneous tissue	7.1 ± 3.5	7.9 ± 2.9	7.8 ± 2.9	7.6 ± 3.1	0.0007	0.6253
After closure of the skin	7.5 ± 3.8	7.8 ± 3.0	8.1 ± 3.1	7.8 ± 3.3	0.0219	0.8532
After tension-reducing	8.4 ± 4.4	9.2 ± 3.5		8.8 ± 4.0	<0.001	0.5884