Concurrent with the trend of increasing breastfeeding rates, this study found a decreasing trend of IHPS beginning in 2002.
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Epidemiological features of infantile hypertrophic pyloric stenosis in Taiwanese children: a Nation-Wide Analysis of Cases during 1997-2007.
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The sentences
The male-to-female incidence rate ratio showed an increasing trend from 3.03 in the first two weeks of life to 8.94 in the 8 th through the 10 th weeks of life, and the overall male-to-female rate ratio was 4.30 as shown in Table 2 .