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. Author manuscript; available in PMC: 2018 Jul 11.
Published in final edited form as: Resuscitation. 2017 Mar 8;114:133–140. doi: 10.1016/j.resuscitation.2017.03.004

Table 2.

Survival to hospital discharge.

Hospital type Difference-in-difference
Teaching Non-teaching Unadjusted Model 1a Model 2b Model 3c
Value P Value P Value P Value P
ICU
May 1060 (18.6%) 437 (17.3%) −3.1% 0.02 −2.2% 0.02 −1.9% 0.07 −1.9% 0.04
July 1007 (17.6%) 461 (19.4%)
Floor
May 892 (23.2%) 417 (21.6%) 1.3% 0.43 1.3% 0.43 1.7% 0.28 1.5% 0.34
July 861 (23.6%) 382 (20.7%)
ED
May 273 (24.2%) 213 (27.7%) −0.3% 0.92 0.1% 0.96 1.4% 0.59 −2.7% 0.36
July 277 (24.2%) 209 (27.9%)

Survival is expressed as a number and percentage for teaching and non-teaching hospitals by location and month. The difference-in-difference value is shown with correlating p value. A negative difference-in-difference value indicates the presence of a July Effect. The first column is an unadjusted analysis. Models 1–3 represent multivariate analyses accounting for certain variables.

a

Adjusted for age, sex, race, and year of the arrest. Data were missing on 1171 patients (7.2%) for the ICU, 669 patients (5.9%) for the floor, and 315 patients (8.3%) for the ED.

b

Adjusted for the same variables in Model 1 as well as admission diagnosis and pre-existing conditions. Data were missing on 1238 patients (7.6%) for the ICU, 718 patients (6.4%) for the floor, and 329 patients (8.7%) for the ED.

c

Adjusted for the same variables in Model 1–2 as well as time of week, time of day, whether a hospital wide response was called, whether the event was witnessed, and the first documented rhythm. Data were missing on 2220 patients (13.6%) for the ICU, 1822 patients (16.2%) for the floor, and 661 patients (17.4%) for the ED.