Table 1.

Characteristics of participants in tonsillectomy cohort

Age, weight, BMI z score and intra-operative morphine requirement are shown as median and inter-quartile range (IQR), and compared between whites and blacks using Wilcoxon rank sum tests; sex, Obstructive Sleep Apnea (OSA), PACU: Postoperative Care Unit; Respiratory depression and prolonged PACU stay due to respiratory depression are shown as frequencies and proportions, and compared using Pearson’s Chi-squared tests.

BMI: Body Mass Index; BMI z scores were calculated using Center for Disease Control (CDC) growth charts.

	Whites (N=267)	Blacks (N=49)	p value
Age (year)	8.4 (7.2, 11.1)	8.8 (7.1, 105)	0.80
Weight (Kg)	33.6 (25.4, 45.3)	34.0 (25.0, 53.8)	0.32
BMI z scores	0.62 (−0.23, 1.59)	0.89 (−0.01, 2.04)	0.09
Intra-operative morphine requirement (mg/kg)	0.20 (0.17, 0.22)	0.19 (0.15, 0.20)	0.41
Total morphine requirement (mg/kg)	0.24 (0.20, 0.29)	0.28 (0.20, 0.34)	0.011
Sex			0.32
Male	135 (51%)	21 (43%)
OSA			0.002
Yes	111 (42%)	32 (65%)
Respiratory Depression			0.38
Yes	75 (28%)	17 (35%)
Prolonged PACU stay due to Respiratory Depression			0.79
Yes	24 (9%)	5 (10%)