Sao luis sex dating

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In other studies, the increase in LBW rate was associated with maternal smoking, multiple births, increasing use of assisted reproductive technology, and changes in the perception of fetal viability [].In São Luís, Brazil, a second birth cohort was performed in 2010, and comparison with data from a previous birth cohort (undertaken in 1997/98) has shown that LBW rates remained stable, in contrast to the ascending rates that have been described earlier in the other two Brazilian cohorts performed in Pelotas [].

Hospital births comprised 96.3% of all births in 1997/98 [] and 98% in 2010.In 1997/98, after exclusion of births from non-residents (n = 290), stillbirths (n = 48), multiples (n = 50) and missing information on study variables (n = 17), 2426 cases remained for analysis.In 2010, after exclusion of stillbirths (70), multiple births (99), newborns weighing ], considered incompatible with GA, were recoded as missing.The rise in LBW rate paralleled reduction in the stillbirth rate, suggesting improvement in obstetrical and newborn care.Maternal, socioeconomic and demographic factors associated with LBW differed between the two cohorts, except for smoking during pregnancy and parity that were significantly associated with LBW in both cohorts. LBW is due either to preterm birth, most common in developed countries, to intrauterine growth restriction (IUGR), more frequent in developing countries or to a combination of both.

LBW rate is estimated to be 15% for developing countries and 7% for developed countries [].

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