Skip to main content

Table 2 Results of the generalized linear mixed model analysis in which patient volume was included as a continuous variable

From: Volume-outcome relationship on survival and cost benefits in severe burn injury: a retrospective analysis of a Japanese nationwide administrative database

Population of severe burn patients adjusted by the prognostic burn index
 Primary outcome N (%) Crude odds ratio (95% CI) p value Adjusted odds ratio (95% CI) p value
  In-hospital mortality 1287 (24.5) 1.07 (1.05–1.09) < 0.001 1.14 (1.09–1.19) < 0.001
 Secondary outcomes Median [IQR] Crude difference (95% CI) p value Adjusted difference (95% CI) p value
  Total healthcare costs per admission, USD 23,628 [7452, 58,458] 3278 (3043–3512) < 0.001 4876 (4436–5316) < 0.001
  Hospital-free days at 90 days, days 28 [0, 67] − 1.6 (− 1.7 to − 1.5) < 0.001 − 3.1 (− 3.4 to − 2.8) < 0.001
Population who were directly transported from the scene of injury adjusted by the prognostic burn index
 Primary outcome N (%) Crude odds ratio (95% CI) p value Adjusted odds ratio (95% CI) p value
  In-hospital mortality 1017 (27.3) 1.14 (1.11–1.18) < 0.001 1.22 (1.17–1.30) < 0.001
 Secondary outcomes Median [IQR] Crude difference (95% CI) p value Adjusted difference (95% CI) p value
  Total healthcare costs per admission, USD 22,723 [7087, 58,753] 6191 (5703–6678) < 0.001 6755 (6076–7434) < 0.001
  Hospital-free days at 90 days, days 22 [0, 66] − 3.0 (− 3.2 to − 2.7) < 0.001 − 4.4 (− 4.9 to − 3.9) < 0.001
Population whose prognostic burn index ≤ 120 adjusted by the prognostic burn index
 Primary outcome N (%) Crude odds ratio (95% CI) p value Adjusted odds ratio (95% CI) p value
  In-hospital mortality 876 (18.4) 1.07 (1.05–1.09) < 0.001 1.16 (1.10–1.22) < 0.001
 Secondary outcomes Median [IQR] Crude difference (95% CI) p value Adjusted difference (95% CI) p value
  Total healthcare costs per admission, USD 25,289 [8356, 59,223] 3823 (3544–4101) < 0.001 6021 (5501–6541) < 0.001
  Hospital-free days at 90 days, days 36 [0, 69] − 1.7 (− 1.9 to − 1.6) < 0.001 − 3.5 (− 3.8 to − 3.2) < 0.001
Cohort of severe burn patients who survived for more than 2 days of admission adjusted by the developed risk adjustment model
 Primary outcome N (%) Crude odds ratio (95% CI) p value Adjusted odds ratio (95% CI) p value
  In-hospital mortality 956 (19.4) 1.07 (1.05–1.09) < 0.001 1.04 (0.98–1.10) 0.174
 Secondary outcomes Median [IQR] Crude difference (95% CI) p value Adjusted difference (95% CI) p value
  Total healthcare costs per admission, USD 26,832 [9224, 62,428] 3871 (3604–4138) < 0.001 6689 (5892–7487) < 0.001
  Hospital-free days at 90 days, days 35 [0, 68] − 1.7 (− 1.8 to − 1.6) < 0.001 − 2.1 (− 2.4 to − 1.8) < 0.001
  1. Patient severity was also adjusted by the hospital unique identifier as a random effect variable. IQR interquartile range, CI confidence interval, USD US dollars