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Necropsy records from two large general hospitals in Dundee showed short-term fluctuations in the prevalence of gall stones that had not previously been described. There was no evidence of a rise in the standardised prevalence rate between 1902-9 and 1953-73. A spurious increase was apparent from the crude prevalence rates for these periods, which resulted simply from the increased age of the patients in the later period. Since there was no real increase in prevalence no conclusions can bedoi:10.1136/bmj.4.5994.427 fatcat:q7abzx343bedtonjhrrwh3ud7a