Table 3. Effect of incident acute cholecystitis on cumulative mortality of different time frame.

Variables		No. of deaths	No. of subjects	Mortality rate, %	aRR	95% CI	P value
30-day mortality
	Patients without cholecystitis	444	15,174	2.93	1
	Patients with cholecystitis	4	36	11.11	4.35	1.66–11.37	0.011
60-day mortality
	Patients without cholecystitis	893	15,174	5.89	1
	Patients with cholecystitis	6	36	16.67	2.88	1.32–3.26	0.031
90-day mortality
	Patients without cholecystitis	1,229	15,174	8.10	1
	Patients with cholecystitis	8	36	22.22	2.71	1.42–5.18	0.017
180-day mortality
	Patients without cholecystitis	1,877	15,174	12.37	1
	Patients with cholecystitis	10	36	27.78	2.15	1.27–3.65	0.039
1-year mortality
	Patients without cholecystitis	2,729	15,174	17.98	1
	Patients with cholecystitis	12	36	33.33	1.78	1.17–2.73	0.032

aRR = adjusted risk ratio, CI = confidence interval.