Table 4.

Hospital Outliers

Hospital*	n	Died	Odds ratio	Hazard ratio (0–8 h)	Hazard ratio (0–1 h)	Hazard ratio (1–2 h)	Hazard ratio (2–8 h)
A	779	7	0.16†	0.20‡	0	0.48	0.16‡
B	1,355	42	1.21	1.46§	3.10†‖	1.69	1.15‖
C	658	18	1.86§	1.81§	0.86	3.82‡‖	1.35
D	587	22	1.91§	2.06†	3.26§	1.32	1.99†
E	1,146	38	2.05†	1.65†	1.25	1.20	1.83†
F	263	12	2.45§	2.70†	1.88	0.98	3.46‡
G	378	23	2.46†	2.25‡	0.85	1.52	2.79‡
H	428	16	2.53†	2.37†	1.21	3.64§	2.20§
I	521	20	2.64†	2.18†	1.87	3.45§	1.89§
J	607	24	2.75‡	2.29‡	3.02	0.99	2.55‡
K	323	12	2.99†	2.75†	1.34	4.93†	2.49§
L	461	10	3.08†	2.46§	0	2.34	2.69§
M	155	12	3.74†	3.44‡	4.59§	3.67§	3.13†

One low hospital outlier and 12 high hospital outliers where a 99% confidence interval or the hospital effect in the LR model or any of the HR models did not include the null value. Hazard ratios are shown first assuming that the effect of the hospital was constant over the 8 hours, and then allowing the effect of the hospital to vary for the time periods 0–1 hour, 1–2 hours, and 2–8 hours. A hazard ratio of 0 results from having no deaths in the given time interval. N=Number of patients with recorded survival times.

^*Anonymous NTDB hospitals are identified by the arbitrary letters A-M.

^†p<0.01 When comparing a hospital-specific estimate to the other hospitals as a group.

^‡p<0.00031 When comparing a hospital-specific estimate to the other hospitals as a group (0.05/161 Bonferroni correction for 161 hospital comparisons).

^§p<0.05 When comparing a hospital-specific estimate to the other hospitals as a group.

^‖p<0.05 (excluding comparisons to a hazard ratio of zero) when comparing a time-specific hazard ratio to the overall hospital hazard ratio.