Abstract: Background We examined the associations of family size and birth order with atopy prevalence in rural Poland at two time periods. Methods Two cross-sectional surveys were conducted in the same villages and a small town of lower Silesia at an interval of 9 years. In 2003, 1700 (88% of eligible individuals), and in 2012, 1730 (86%) inhabitants aged 5 years or more completed a questionnaire and had a skin prick test for atopy. Results There was an inverse association between family size and atopy in the village population in 2003; the prevalence o...
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Topics: 
Demography
Pediatrics