Skip to main content

Table 1 Demographic characteristics and perioperative data

From: A retrospective cohort study on red blood cell morphology changes in pre-school age children under nitrous oxide anesthesia

  Air group N2O group P value
Number of patients 65 71  
Male, N (%) 42 (64.6) 46 (64.8) 0.983
Age (months) 43.6 ± 14.4 43.5 ± 13.0 0.827
Weight (kg) 15.7 ± 4.1 16.1 ± 3.7 0.381
Height (cm) 97.3 ± 10.7 97.6 ± 10.7 0.789
Duration of surgery (min) 167.5 ± 37.1 172.4 ± 35.5 0.265
Duration of anesthesia (min) 233.6 ± 38.8 230.9 ± 40.0 0.912
N2O inspiration concentration (%) n.a. 50 [50–50] < 0.001
Cumulative N2O dose (N2O × time) n.a. 100.5 [84.0–112.5] < 0.001
Length of stay (days) 13.8 ± 4.2 13.6 ± 4.8 0.766
Preoperative red blood cell (1012/L) 4.6 ± 0.4 4.6 ± 0.3 0.828
Preoperative hemoglobin (g/L) 127.7 ± 9.1 126.7 ± 7.1 0.496
Preoperative white blood cell (109/L) 7.0 ± 1.5 7.0 ± 1.4 0.945
Preoperative platelet (109/L) 314.3 ± 73.3 293.9 ± 68.7 0.094
  1. Data are presented as numbers (percentage), or mean ± standard deviation. N2O nitrous oxide; n.a. not applicable due to low count