Epidemiology of isolated preaxial polydactyly type I: data from the Polish Registry of Congenital Malformations (PRCM).

BMC Pediatr · 2013 · PMC3654975 · PMID 23421878

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highly significantno p-value reported

Despite these limitations, our data demonstrate that lower birthweight is a very strong and highly significant risk factor only for sporadic PPD1, but not for the familial forms of polydactyly.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.