Table 2.

Predictors of long-term mortality—univariate regression analysis

Risk factor		n	HR	95% CI	P value
Age	Under 20	20	–
(reference <20 years)	20–29	72	1.6	0.2 to 13.1	0.674
	30–39	131	2.9	0.4 to 21.8	0.296
	40–49	175	3.9	0.5 to 28.5	0.180
	50–59	206	5.0	0.7 to 36.5	0.110
	60–69	218	7.9	1.1 to 57.0	0.040
	70–79	221	8.7	1.2 to 62.4	0.032
	80+	113	17.3	2.4 to 124.4	0.005
Gender	Male	650	–
(reference male)	Female	506	1.2	1.0 to 1.5	0.049
Charlson score	0	833	–
(reference 0)	1	168	2.6	2.0 to 3.4	<0.001
	2	112	4.7	3.6 to 6.2	<0.001
	3	31	3.8	2.4 to 6.1	<0.001
	4 or more	9	5.3	2.4 to 12.0	<0.001
Number of comorbid conditions	0	833	–
(reference 0)	1	262	3.2	2.6 to 4.0	<0.001
	2	47	4.5	3.0 to 6.7	<0.001
	3	11	3.3	1.5 to 7.5	0.004
Length of stay	Less than 20 days	1079	–
(reference <20 days)	Longer than 20 days	77	0.4	0.2 to 0.8	0.006
Level of critical care	ICU	251	–
(reference ICU)	HDU	905	1.2	1.0 to 1.4	0.019

The HR, 95% CI and p value of Wald’s test are presented for each variable found to significantly affect postdischarge survival on univariate regression analysis. P<0.05 was considered significant. The reference category for each variable is appended. Age has been transformed to a categorical variable for the purposes of the analysis.

ccAP, acute pancreatitis requiring critical care admission; HDU, high-dependency unit; ICU, intensive care unit; n, number of patients per category.