Pregnant asthmatic women carrying a girl suffer worse asthma than those carrying a boy, US researchers have said. In the three-year study, the peak flow of 702 New England mothers-to-be was measured. Peak flow lability was calculated as per cent daily maximum minus the minimum divided by the mean. Lability in women carrying a girl was 10 per cent worse than in those carrying a boy (Am J Epidem 2006; 163: 217-21).
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