Table 5.

Univariate analysis of preoperative patient and procedure characteristics and minor and major events.

Variable	Minor events		Major events
	Odds ratio (95% CI)	P	Odds ratio (95% CI)	P
Demographics
Age < 1 month	1.23 (0.23–7.25)	0.75	0.68 (0.072–6.41)	0.74
Age < 12 months	1.26 (0.56–2.86)	0.58	0.84 (0.27–2.57)	0.76
Weight < 5 kg	1.03 (0.47–2.21)	0.95	0.67 (0.25–1.75)	0.41
Weight < 10 kg	0.95 (0.37–2.42)	0.92	0.84 (0.22–3.20)	0.8
Sex	1.12 (0.53–2.39)	0.77	2.2 (0.74–6.55)	0.15
Preoperative medication therapies
Diuretic therapy	0.74 (0.28–1.99)	0.56	0.77 (0.24–2.44)	0.65
Systemic steroid	1.83 (0.78–4.27)	0.16	1.44 (0.48–4.32)	0.51
Supplemental oxygen	1.52 (0.64–3.61)	0.34	0.47 (0.13–1.64)	0.24
Phosphodiesterase 5 inhibitors	1.45 (0.65–3.44)	0.35	1.41 (0.45–4.37)	0.55
Inhaled nitric oxide	0.32 (0.11–0.98)	0.046	3.92 (0.87–17.60)	0.074
Endothelin receptor antagonists	0.63 (0.26–1.55)	0.32	0.34 (0.045–2.55)	0.29
Prostacyclin analog	0.24 (0.087–0.69)	0.008	1.19 (0.11–13.36)	0.89
Digoxin	0.47 (0.19–2.61)	0.61	1.41 (0.13–15.4)	0.78
Anesthesia
ASA class	n/a	0.5	n/a	0.21
Repeated airway attempts	1.26 (0.36–4.41)	0.72	0.64 (0.12–3.50)	0.61
Prolonged anesthesia (> 75th percentile)	0.55 (0.2–1.55)	0.26	0.93 (0.27–3.27)	0.91
Minor events	n/a	n/a	1.39 (0.42–4.57)	0.59

ASA, American Society of Anesthesiologists Physical Status; CI, confidence interval; n/a, not applicable.