Effects of pressure-controlled ventilation targeting end-inspiratory flow rate on pulmonary complications and inflammation levels in patients undergoing spinal surgery in the prone position: a randomized clinical trial

Table 3 Comparison of the anesthesia time, operation time, and intraoperative intake and output volume of the three groups

Group	n	Anesthesia time (min, \(\bar x \pm s\))	Operation time (min, \(\bar x \pm s\))	Infusion volume (mL, \(\bar x \pm s\))	Blood loss (mL, \(\bar x \pm s\))	Urine output (mL, \(\bar x \pm s\))	Number of blood transfusion cases [n (%)]
Group V	61	189 ± 44	134 ± 41	1149 ± 330	438 ± 208	275 ± 144	7(11.48)
Group P₁	62	195 ± 47	140 ± 43	1219 ± 360	473 ± 164	312 ± 136	5(8.06)
Group P₂	64	186 ± 54	131 ± 47	1155 ± 378	458 ± 161	298 ± 138	6(9.38)
F/χ² value		0.512	0.647	0.493	0.590	1.161	0.418
P value		0.600	0.525	0.611	0.555	0.315	0.811

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