Table 2.

Hazard ratio for the development of pneumonia in patients with multiple rib fractures using the Fine-Gray proportional hazards regression model.

	Unadjusted model			Adjusted model 1*			Adjusted model 2**
	HR	95% CI	p-value	HR	95% CI	p-value	HR	95% CI	p-value
Multiple rib fracture	4.63	2.35–9.13	<0.001	5.00	2.48–10.10	<0.001	4.03	2.08–7.82	<0.001
Propensity score	–	–	–	0.46	0.05–4.14	0.48	0.6	0.06–6.30	0.67
Therapeutic hypothermia	–	–	–	–	–	–	3.73	1.66–8.40	0.002
Prophylactic antibiotics use	–	–	–	–	–	–	0.45	0.23–0.87	0.02

^*Adusted for propensity score.

^**Adjusted for propensity score, therapeutic hypothermia, and use of prophylactic antibiotics. HR, hazard ratio; CI, confidence interval.