Although addition of placental weight to the model did reduce the strength of the associations between BMI, smoking, parity, ethnicity or fetal gender and total hCG (MoM) levels, these associations remained highly significant.
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Reference ranges and determinants of total hCG levels during pregnancy: the Generation R Study.
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The sentences
Although there was an overall trend for lower estimates as compared to the non-parametric methods, these differences overall did not reach statistical significance.