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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Gynecol Oncol. 2015 Jul 12;139(3):506–512. doi: 10.1016/j.ygyno.2015.07.015

Table 4.

Hazard ratios for death based on different modeling techniques for hospital volume.

Annualized
volume		 Previous year
volume		 Current year volume
Continuous volume 0.99 (0.98-1.00) 1.00 (0.99-1.01) 0.99 (0.98-1.00)*
Volume cut-points
Lowest Referent Referent Referent
Second 1.01 (0.92-1.11) 0.97 (0.90-1.06) 0.96 (0.89-1.05)
Third 0.97 (0.90-1.05) 0.94 (0.85-1.04) 0.95 (0.88-1.02)
Highest 0.91 (0.82 -1.02) 0.94 (0.85-1.03) 0.90 (0.82-0.97)*

Hazard ratio (95% confidence interval).

*

P<0.05.

Adjusted for clinical and demographic characteristics and quality of treatment.