ANOVA Analysis of variance
AR Absolute risk
ARR Absolute risk reduction
ARI Absolute risk increase
CI Confidence interval
CCT Controlled clinical trial
HR Hazard ratio
NNH Number needed to harm
NNT Number needed to treat
OR Odds ratio
P P value
RCT Randomised controlled trial
RR Relative risk
RRI Relative risk increase
RRR Relative risk reduction
SD Standard deviation
SE Standard error
SEM Standard error of the mean
WMD Weighted mean difference