Risk Factors for Hospital and Long-Term Mortality of Critically Ill Elderly Patients Admitted to an Intensive Care Unit

Table 6

Standardized mortality ratio of the two groups after hospital discharge.

Mortality following hospital discharge
Age group	Number of patients in study cohort	Age-adjusted mortality per 1000 in standard population	Number of deaths	Total number of deaths expected
15–19	20	0.2	1	0.004
20–24	64	0.3	5	0.0192
25–29	56	0.3	0	0.0168
30–34	53	0.4	2	0.0212
35–39	47	0.5	6	0.0235
40–44	66	0.9	7	0.0594
45–49	101	1.7	21	0.1717
50–54	163	2.8	31	0.4564
55–59	134	4.4	30	0.5896
60–64	150	7	35	1.05
Age group < 65	854		138	2.4118
Expected mortality over 3.1 years =
SMR = 138/7.47 = 18.47
65–69	162	12.6	42	2.0412
70–74	175	19.9	44	3.4825
75–79	186	37	59	6.882
80–84	105	57.4	33	6.027
85+	81	116.4	21	9.4284
Age group ≥ 65	709	199	27.8611
Expected mortality over 3.1 years =
SMR = 199/86.37 = 2.3

SMR: standardized mortality ratio.