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 mortality			90-day mortality
	OR	95% CI	P value	OR	95% CI	P value
Surgical urgency within 6 hours
Unadjusted	1.01	0.97 to 1.05	0.604	1.01	0.98 to 1.04	0.482
Patient-level model	1.01	0.97 to 1.05	0.650	1.01	0.97 to 1.05	0.633
Multilevel model	1.02	0.97 to 1.06	0.512	1.02	0.97 to 1.06	0.472
Surgical urgency within 2 hours
Unadjusted	1.04	0.98 to 1.11	0.226	1.03	0.97 to 1.09	0.341
Patient-level model	1.02	0.95 to 1.10	0.560	1.01	0.94 to 1.08	0.864
Multilevel model	1.02	0.95 to 1.10	0.574	1.01	0.94 to 1.08	0.858

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.