Critically ill patient mortality by age: long-term follow-up (CIMbA-LT)

Annals of Intensive Care

Table 4 Long-term excess mortality according to age group

Age groups (years)	Gender	N	Observed one-year mortality	Relative risk	95% Confidence interval	p-value
18–50 Adult	Male	4092	478	21.7	(14.2–33.2)		< 0.001^**
	Female	2538	261	20.1	(11.5–35)	0.079^*
	Total	6630	739	21.1	(15.1–39.6)
≥ 50–65 Senior	Male	5060	857	15.3	(11.7–20)
	Female	2746	383	22.5	(13.9–36.5)	0.001^*
	Total	7806	1240	17.0	(13.4–21.5)
≥ 65–80 Old	Male	5696	1268	7.2	(6.2–8.4)
	Female	4158	817	10.6	(8.4–13.3)	0.002^*
	Total	9854	2085	8.2	(7.3–9.4)
≥ 80 Very-old	Male	1850	598	2.4	(2.1–2.7)
	Female	2062	564	2.5	(2.2–2.9)	0.001^*
	Total	3912	1162	2.4	(2.2–2.7)
Total	Male	16,698	3201	6.3	(5.8–6.9)
	Female	11,504	2025	6.1	(5.5–6.8)	0.001^*
	Total	28,202	5226	6.3	(5.8–6.7)

Only patients discharged alive from the Hospital were included. Observed mortality refers to the absolute number of deaths that occurred; Relative risk according to the estimated mortality for a virtual population of the same age and gender, according to Portuguese data published by the Portuguese National Institute of Statistics, 2020 [10]
Chi-square test for:
^*Differences between males and females
^**Differences between age groups