Reporting bias in retrospective ascertainment of drug-induced embryopathy.

Bar-Oz, B; Moretti, M E; Mareels, G; Van Tittelboom, T; Koren, G · Lancet · 1999

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Abstract

The rate of congenital malformations after first-trimester exposure to itraconazole was four times higher when ascertained retrospectively than prospectively (13.0 vs 3.2%, p=0.006). Reporting bias in retrospective studies should be acknowledged in interpretation of such data.

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