Calculation of NNT in meta-analysis. The calculation of NNT (number needed to treat) in meta-analysis is described using RR and OR, which are more robust against variability in baseline risk.
The meaning of p-value. The meaning of p-value is the probability of obtaining a value equal to or more distant from the equality of effect given that the null hypothesis is true.
Pitfalls of statistics. Some of the inappropriate uses of statistics are described, either due to ignorance or to modify the apparent relevance of the results.