In a large clinical trial, patients were randomised into two groups to study the impact of bispectral index (BISTM) monitoring on the incidence of awareness.
The table below shows the results.
Data analysis found that the statistical difference in the incidence of awareness had a p value of 0.022.
The study reported that BIS-guided anaesthesia reduced the risk of awareness by 82% (95% confidence interval 17-98%) with an odds ratio of 0.2 and a number needed to treat of 140.
Define the following terms and explain their meaning in relation to this study: