| No overdispersion | Moderate overdispersion | High overdispersion | |||
---|---|---|---|---|---|---|
RaRa = 0.79 | RaRa = 0.73 | RaRa = 0.72 | ||||
 | Mean differenceb | SD | Mean difference | SD | Mean difference | SD |
Dichotomise RR | 0.01 | 0.09 | 0.05 | 0.09 | 0.05 | 0.09 |
Poisson RaR | <0.01 | 0.01 | <0.01 | 0.01 | <0.01 | 0.01 |
Simple RaR | <0.01 | 0.01 | <0.01 | 0.01 | <0.01 | 0.01 |
Time to the first event HR | 0.01 | 0.09 | 0.02 | 0.10 | 0.02 | 0.09 |
Marginal model HR | 0.01 | 0.09 | 0.02 | 0.09 | 0.02 | 0.09 |
Andersen-Gill HR | <0.01 | 0.09 | 0.02 | 0.09 | 0.02 | 0.09 |
Ratio of means | <0.01 | 0.03 | 0.02 | 0.03 | <0.01 | 0.03 |
Ratio of medians | Not possible as both medians are zero |