We made a mistake in Fig. 4 due to an abnormality in the order of the statistical parameters in the software (Stata 12.0 with ado-file metan)
Our statistician used an incorrect calculation by mistake:
(N_treat/(N_treat+N_contr)) : (event_treat/(event_treat + event_contr)
instead of:
(event_treat/N_treat) : (event_contr/N_contr)
The error does not have any impact on the results, but
Fig. 4(a), (b) did not show the correct data. Here are the recalculated correct figures(Reference Doege, Grajecki and Zyriax1).
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:5347:20160427083059305-0432:S0007114512001729_fig1g.gif?pub-status=live)
Fig. 4(a)
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:59985:20160427083059305-0432:S0007114512001729_fig2g.gif?pub-status=live)
Fig. 4(b)