Skip to main content

Table 2 Simulation results for the very low mean (control 0.2, treatment 0.15)

From: Do alternative methods for analysing count data produce similar estimates? Implications for meta-analyses

 

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

  1. SD standard deviation
  2. aRate ratio from negative binomial regression model
  3. bMean of the estimate minus negative binomial rate ratio