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Table 5 Unadjusted and adjusted coefficients of hospital volume for different outcome measures, expressed as odds ratio or beta

From: The volume-outcome relationship among severely injured patients admitted to English major trauma centres: a registry study

Outcome OR per 10 patients 95% CI P-value
In-hospital mortality
 Unadjusted OR 1.64 1.04–2.61 0.03
 Adjusted* OR 1.01 0.64–1.60 0.96
  Beta
Length of stay (days)
 Unadjusted β 0.66 −0.15 - 1.47 0.11
 Adjusted* β 0.40 − 0.45 - 1.24 0.34
Critical care length of stay (days)
 Unadjusted β −0.02 −0.36 – 0.32 0.89
 Adjusted* β −0.04 −0.32 – 0.23 0.76
Time to operation (hours)
 Unadjusted β 0.004 −0.03 - 0.03 0.97
 Adjusted* β 0.005 −0.03 – 0.03 0.75
Time to CT (hours)
 Unadjusted β −0.03 −0.05 - -0.01 0.01
 Adjusted* β −0.003 −0.007 - 0.001 0.11
  1. *Adjusted for age, gender, age*gender (interaction term), NISS (spline), Revised Trauma Score, Charlson Comorbidity Index, penetrating injury, referred patients