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This is a fascinating approach to the problem of Bell's palsy. I think the statistics as presented are misleading. They describe an incidence in pregnancy of one in 2,600 based upon 15 cases of Bell's palsy over a ten-year period during which there were 40,000 deliveries. They then compare this incidence of one in 2,600 with the incidence in the general population of one in 8,000. Basically, what they have done is to study the incidence in a female population with a limited age distribution. It does not seem reasonable to conclude that the increased incidence is related to pregnancy when, in fact, it could be related to the age and sex distribution of the population selected.
DONALDSON JA. BELL'S PALSY-Reply. Arch Otolaryngol. 1972;95(2):192–193. doi:10.1001/archotol.1972.00770080280024