Emergency open cholecystectomy is associated with markedly lower incidence of postoperative nausea and vomiting (PONV) than elective open cholecystectomy: a retrospective cohort study

Table 2 Distribution of postoperative nausea and vomiting by hospital and urgency of open cholecystectomy.

Hospital	Acuity	No. Cases	PONV OR/RR No.(%)	PONV Ward No.(%)	PONV No.(%)(95% CI)
CRH	Emerg	41	0(0%)	3(7.3%)	3(7.3%)(1.5 - 19.9%)
	Elect	150	8(5.3%)	41(27.3%)	42(28%)(21 - 35.9%)
UHWI	Emerg	50	1(2%)	3(6%)	3(6%)(1.3 - 16.5%)
	Elect	25	0(0%)	8(32%)	8(32%)(14.9 - 53.5%)
TOTAL	Emerg	91			6(6.6%)(2.5 - 13.8%)
	Elect	175			50(28.6%)(22 - 35.9%)

OR/RR = Operating room/Recovery room
CI = Confidence interval
For risk of PONV after emergency versus elective open cholecystectomy at CRH, P = 0.006 (chi-squared test).
For risk of PONV after emergency versus elective open cholecystectomy at UHWI, P = 0.003 (chi-squared test).
For risk of PONV after emergency versus elective open cholecystectomy at both hospitals combined, P < 0.001 (chi-squared test).
Unadjusted odds ratio for effect of emergency on PONV risk = 0.176 (CI, 0.072 - 0.43, P < 0.001).

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