Table 2

Adjusted and unadjusted effects of estimated travel time on mortality expressed as OR per 10 min of travel time. Full multilevel models are shown in online supplementary tables 4 and 5

30-day mortality90-day mortality
OR95% CIP valueOR95% CIP value
Surgical urgency within 6 hours
 Unadjusted1.010.97 to 1.050.6041.010.98 to 1.040.482
 Patient-level model1.010.97 to 1.050.6501.010.97 to 1.050.633
 Multilevel model1.020.97 to 1.060.5121.020.97 to 1.060.472
Surgical urgency within 2 hours
 Unadjusted1.040.98 to 1.110.2261.030.97 to 1.090.341
 Patient-level model1.020.95 to 1.100.5601.010.94 to 1.080.864
 Multilevel model1.020.95 to 1.100.5741.010.94 to 1.080.858
  • Adjusting variables in patient-level model: age, age2, ASA, respiratory history, cardiac history, malignancy, sex, index of multiple deprivation, audit year, time of hospital admission, time from admission to theatre, age * ASA, respiratory history * ASA. Multilevel model: patient-level model variables and random intercept term for hospital.

  • ASA, American Society of Anesthesiologists.