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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Am J Transplant. 2011 Aug 10;11(10):2197–2204. doi: 10.1111/j.1600-6143.2011.03684.x

Table 4.

Relative risk of death (hazard ratio) based on survival at follow up*

Overall cohort Group A Group C Group D
Time since transplant
0-6 months 1.9 (1.3 to 2.7)
p < 0.0005		 0.5 (0.2 to 1.2)
p = 0.11		 5.1 (1.1 to 23.1)
p = 0.03		 2.7 (1.7 to 4.4)
p < 0.0005
6 months- 2 years 1.3 (0.9 to 2.0)
p = 0.22		 1.8 (0.7 to 4.2)
p = 0.21		 1.3 (0.5 to 3.3)
p = 0.65		 1.1 (0.6 to 1.9)
p = 0.86
≥ 2 years 0.9 (0.5 to 1.9)
p = 0.86		 1.6 (0.5 to 4.7)
p = 0.42		 0.8 (0.2 to 3.9)
p = 0.77		 0.9 (0.3 to 2.3)
p = 0.78
*

Hazard ratio (95% Confidence Interval) adjusted for center volume and transplant type. A hazard ratio of >1.0 represents greater risk for death for patients requiring pre-transplant mechanical ventilation compared to those not requiring mechanical ventilation.