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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)