Adjusted odds ratios (aORs) of singleton extremely preterm, very preterm and moderately preterm births for the years 1987–2010 in Finland.
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aReference population: singleton term pregnancies (≥37 weeks), n = 1,133,367, bBMI = body mass index, corresponding to the years 2004−2010, reference group n = 236,091. cIVF = in-vitro fertilization, corresponding to the years 1991−2010.
创建时间：
2013-04-05
