Risk of suicide in twins: Intelligence of twins and singletons may explain risk

doi:10.1136/bmj.327.7424.1168-a

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Martin Voracek (martin.voracek@akh-wien.ac.at), research resident

Department of Psychoanalysis and Psychotherapy, Statistics and Documentation Branch, University of Vienna Medical School, A-1090 Vienna, Austria

EDITOR—Tomassini et al presented evidence for a lower suicide rate of twins compared with singletons.1 However, they did not present any data supporting their preferred explanative factor (“strong family ties”) for this finding, and their explanation is therefore speculative. Other causal factors need to be considered. I give one …