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Table 3 Distribution of pregnancies through gestation according to demographic characteristics

From: The impact of temporal variability of biochemical markers PAPP-A and free β-hCG on the specificity of the first-trimester Down syndrome screening: a Croatian retrospective study

Group Week of gestation Number Maternal age
(years)*
Mean ± SD
Maternal weight
(kg) **
Mean ± SD
Smokers ***
N (%)
1 10 to 10+6/7 96 31.7 ± 4.5 66.9 ± 12.8 10 (10.4%)
2 11 to 11+6/7 853 31.5 ± 4.6 66.4 ± 11.2 91 (10.7%)
3 12 to 12+6/7 1326 31.4 ± 4.4 65.4 ± 10.6 153 (11.5%)
4 13 to 13+6/7 608 31.4 ± 4.4 65.6 ± 10.4 61 (10.0%)
  Total 2883 31.5 ± 4.5 66.1 ± 11.3 315 (10.9%)
  1. * p = 0.834 (one-way analysis of variance)
  2. ** p = 0.124 (one-way analysis of variance)
  3. *** p = 0.779 (χ2 =1.093)