Factor | Full cohort (n = 2002) | Total study sample (n = 370) | P-value (full cohort vs. total study sample) | Non-smoking mothers with BETX assessment (n = 56) | P-value (Total study sample vs. subset of 56) |
---|---|---|---|---|---|
Mother's age, mean ± SD, years | 29.99 ± 4.89 | 29.77 ± 4.72 | 0.39 | 29.25 ± 3.64 | 0.37 |
19 - 24.9 (%) | 11.71 | 9.88 | 0.26 | 3.7 | 0.12 |
25 - 34.9 (%) | 70.95 | 74.55 | Â | 87.04 | Â |
> 35 (%) | 17.34 | 15.57 | Â | 9.26 | Â |
BMI, mean ± SD, kg/m2 | 26.32 ± 4.46 | 25.89 ± 4.10 | 0.1 | 25.00 ± 3.37 | 0.13 |
Normal (%) | 45.09 | 48.77 | 0.22 | 57.14 | 0.56 |
Overweight (%) | 37.82 | 36.78 | Â | 35.71 | Â |
Moderate obesity (%) | 12.13 | 11.44 | Â | 5.36 | Â |
Severe obesity (%) | 3.69 | 1.91 | Â | 1.79 | Â |
Morbid obesity (%) | 1.27 | 1.09 | Â | 0 | Â |
Employment status, % | 71.23 | 74.12 | 0.17 | 78.57 | 0.48 |
Full-time | 77.4 | 77.74 | 0.9 | 80 | 0.73 |
Part-time | 22.6 | 22.26 | Â | 20 | Â |
Passive smoking, % | Â | Â | Â | Â | Â |
During 1st trimester | 30.68 | 32.25 | 0.47 | 28.57 | 0.58 |
During 2nd trimester | 28.62 | 28.73 | 0.96 | 25 | 0.56 |
During 3rd trimester | 26.21 | 25.75 | 0.82 | 25 | 0.91 |
Active smoking , % | Â | Â | Â | Â | Â |
Before pregnancy | 36.28 | 32.97 | 0.1 | 23.21 | 0.14 |
During 1st trimester | 25.84 | 20.71 | 0.01 | 0 | 0.04 |
During 2nd trimester | 17.55 | 15.26 | 0.19 | 0 | 0.001 |
During 3rd trimester | 16.73 | 17.12 | 0.82 | 0 | 0.002 |
Maternal history of allergies, % | 51.74 | 51.1 | 0.78 | 51.79 | 0.92 |
Gestational duration, mean ± SD, weeks | 39.22 ± 1.75 | 39.41 ± 1.22 | 0.54 | 39.45 ± 1.16 | 0.72 |
< 37 weeks (%) | 6.17 | 2.43 | 0.004 | 1.79 | 0. 09 |
≥ 37 weeks (%) | 93.83 | 97.57 |  | 98.21 |  |
Birth weight, mean ± SD, g | 3279 ± 585 | 3343 ± 456 | 0.05 | 3359 ± 396 | 0.58 |
< 2, 500 g (%) | 10.61 | 2.43 | < 0.0001 | 1.79 | 0.09 |
≥ 2, 500 g (%) | 89.39 | 97.57 |  | 98.21 |  |
Newborn's sex , % | Â | Â | Â | Â | Â |
Male | 52.55 | 49.19 | 0.15 | 57.14 | 0.27 |
Female | 47.45 | 50.81 | Â | 42.86 | Â |
Season of birth*, % | Â | Â | Â | Â | Â |
Autumn | 22.22 | 16.8 | 0.003 | 14.29 | 0.43 |
Winter | 21.03 | 22.76 | Â | 30.36 | Â |
Spring | 30.17 | 36.59 | Â | 39.29 | Â |
Summer | 26.58 | 23.85 | Â | 16.07 | Â |