Skip to main content

Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Table 4 Standardised mortality ratio (SMR), mean and (95% CI)

From: Non-randomised patients in a cholecystectomy trial: characteristics, procedures, and outcomes

   0 – 90 days 91 – 365 days
  N Deaths SMR Deaths SMR
Trial patients 724 1 1.61 (0.02 – 3.46) 3 0.62 (0.13 – 1.78)
Non-randomised patients 993 23 3.42 (2.17 – 5.13) 26 1.27 (0.90–1.86)