Table 3.

Relative risk ratios for various in-ICU mortality risk groups in different populations

Risk	MIMIC-III			MIMIC-IV
	Patients, N	Mortality, %	RR	Patients, N	Mortality, %	RR
> 80%	149	83.89	5.13	334	82.63	7.71
60–79%	189	63.49	3.88	414	62.08	5.79
40–59%	321	46.73	2.86	602	40.20	3.75
20–39%	708	29.1	1.78	1404	22.93	3.75
< 19%	4158	7.29	0.45	12,778	4.45	0.41
Total	5525	16.36	-	15,532	10.72	-
Risk	eICU			Zigong
	Patients, N	Mortality, %	RR	Patients, N	Mortality, %	RR
> 80%	203	82.76	7.49	30	76.67	2.17
60–79%	473	70.19	6.36	158	56.96	1.61
40–59%	820	44.02	3.99	333	43.84	1.24
20–39%	2329	23.66	2.14	567	27.41	0.78
< 19%	18,792	5.78	0.52	210	17.14	0.49
Total	22,617	11.04	-	1198	35.31	-

RR Relative risk ratios