Table 3.

Complete modeling output for Cox regression, with inverse-probability treatment weighting, adjustments, stabilized weights and accounting for competing risks.

Variable	SHR	95% CI	P-value
Prone positioning intervention (yes vs no)
No	Reference	-	-
Yes	0.61	0.46–0.80	< 0.001
Age
< 41 years	Reference	-	-
41–60 years	2.68	0.83–8.59	0.10
61–80 years	4.45	1.39–14.20	0.01
> 80 years	7.11	2.13–23.76	0.001
Sex
Female	Reference	-	-
Male	1.06	0.78–1.44	0.69
Race
White	Reference	-	-
Hispanic	0.33	0.18–0.60	< 0.001
Black	0.38	0.20–0.73	0.003
Asian	*	*	*
Other	0.34	0.12–0.96	0.04
Body mass index, No. (%)
< 18.5kg/m2	*	*	*
18.5–24.9 kg/m2	Reference	-	-
25–29.9 kg/m2	0.85	0.53–1.36	0.49
≥ 30 kg/m2	0.87	0.57–1.33	0.52
APACHE-II score	1.01	0.99–1.03	0.26
Vasopressor use
No	Reference	-	-
Yes	1.18	0.76–1.85	0.46

^*Observations were dropped from model due to small N and no variability in treatment (e.g. all within category were treated or all within category were not treated)