Table 4

Results of Poisson regression to examine statistical difference in counts of surgery types among hospitals over 2 years. Seasonality was included in the model but omitted from the table

InstitutionRegression coefficientsP value
Trauma/general surgery
 1*
 2−0.6033<0.0001
 3−0.5131<0.0001
 4−0.9672<0.0001
Orthopedics
 1*
 2−0.3080<0.0001
 3−0.7798<0.0001
 4−0.9911<0.0001
Neurosurgery
 1*
 2−0.6366<0.0001
 3−0.5833<0.0001
 4−1.2763<0.0001

  • *Reference category; significance level is p<0.05; control variables days of the week and season were omitted from the table.