Note: Odds ratios refer to the odds of the outcome in trusts with a day-case rate ≥ 80% relative to a trust with day-case rates < 50% (reference group). An odds ratio less than 1 indicates that the outcome was less common for high day-case rate trusts and an odds ratio greater than 1 indicates that the outcome was more common for high day-case rate trusts. A 95% confidence interval which does not cross the value 1 indicates statistical significance at the 5% level.