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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: JAMA Intern Med. 2016 Sep 1;176(9):1361–1368. doi: 10.1001/jamainternmed.2016.3919

Table 3.

Survival benefit of PSC admission stratified on travel time

Travel time
7-day survival benefit* 30-day survival benefit*
Adjusted difference (95% CI) P-value Adjusted difference (95% CI) P-value
Less than 20 minutes 2.0% (1.2% to 2.9%) <0.01 2.7% (1.5% to 3.9) <0.01
20 to 40 minutes 1.6% (1.2% to 1.9%) <0.01 1.8% (1.3% to 2.2%) <0.01
40 to 60 minutes 1.9% (2.5% to 1.3%) <0.01 2.6% (0.7% to 2.8%) <0.01
60 to 90 minutes 0.7% (−0.1% to 1.5%) 0.10 1.7% (0.2% to 2.4%) <0.01
Over 90 minutes 1.3% (−1.2% to 3.9%) 0.31 0.1% (−3.1% to 3.3%) 0.95
*

Numbers represent probability differences in a two-stage approach with a Probit function in the second stage, using differential travel time of the patient to a PSC versus a non-PSC hospital as an instrument.