This is an archived version. For the current version, please go to training.cochrane.org/handbook/current.

16.9  Rare events (including zero frequencies)

16.9.1 Meta-analysis of rare events

16.9.2 Studies with zero-cell counts

16.9.3 Studies with no events

16.9.4 Confidence intervals when no events are observed

16.9.5 Validity of methods of meta-analysis for rare events