Single Dose Intravenous Paracetamol versus Placebo in Postorthognathic Surgery Pain: A Randomized Clinical Trial

Table 3

Side effects from morphine according to the treatment groups.

Characteristics	Total (n = 62)	Study group (n = 31)	Control group (n = 31)	value
Nausea, n (%)				<0.001^a
Yes	14 (22.6)	1 (3.2)	13 (41.9)
No	48 (77.4)	30 (96.8)	18 (58.1)
Vomit, n (%)				0.002^b
Yes	9 (14.5)	0 (0)	9 (29)
No	53 (85.5)	31 (100)	22 (71)
Pruritus, n (%)				0.053^b
Yes	5 (8.1)	0 (0)	5 (16.1)
No	57 (91.9)	31 (100)	26 (83.9)
Urine retention, n (%)				1.000^b
Yes	0 (0)	0 (0)	0 (0)
No	62 (100)	31 (100)	31 (100)
Respiratory depression, n (%)				1.000^b
Yes	1 (1.6)	0 (0)	1 (3.2)
No	61 (98.4)	31 (100)	30 (96.8)

^aDifferences between treatment groups were tested using Pearson’s chi-square test. ^bDifferences between treatment groups were tested using Fisher’s exact test. A significant difference is indicated in bold.