Table 5.

Patients with respiratory depression at each time point

	Overall (n = 167)	Morphine (n = 83)	Nalbuphine (n = 84)	p value
PACU	19 (11.4)	15 (18.1)	4 (4.8)	0.014
PACU + 15 min	13 (7.8)	13 (15.7)	0 (0.0)	<0.001
PACU + 30 min	2 (1.3)	2 (2.7)	0 (0.0)	0.221
PACU + 45 min	1 (0.7)	1 (1.4)	0 (0.0)	1
PACU + 60 min	1 (0.7)	1 (1.4)	0 (0.0)	1
Total	36	32	4

Value is number (percentage, %). Respiratory depression was defined as RR was less than lower limit (1st percentile) for respiratory rate in 2-year-old is 18, 3-year-old is 17, and 4- to 5-year-old is 17.