Friday the 13thBMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6932.859b (Published 26 March 1994) Cite this as: BMJ 1994;308:859
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- S J Iversen
- Steyning, West Sussex BN44 3NH.
Editor,--C D O'Brien states that “actuarial investigation has shown that the 13th of a month is more likely to be a Friday than any other …