Table 2.

Unadjusted hazard ratio (95% CI) for 90-day survival probability by clusters

	90-day mortality	Hazard ratio	95% CI
At baseline
Cluster 1 (n = 1402)	383 (27.3%)	Reference
Cluster 2 (n = 2341)	1025 (43.8%)	1.82	1.62–2.05
Day 3
Cluster 1 (n = 1557)	321 (20.6%)	Reference
Cluster 2 (n = 2086)	1023 (49.0%)	2.97	2.62–3.37
Change from baseline to day 3
From 1 to 1 (n = 919)	172 (18.7%)	Reference
From 1 to 2 (n = 458)	200 (43.7%)	2.77	2.26–3.40
From 2 to 1 (n = 638)	149 (23.4%)	1.26	1.02–1.58
From 2 to 2 (n = 1628)	823 (50.6%)	3.45	2.93–4.07