Table 1.
Demographic data and clinical characteristics of the study population
| Cases (n = 188) | Controls (n = 391) | p-value | |
|---|---|---|---|
| Age, years |
30.1 ± 5.8 |
30.1 ± 5.8 |
0.989 |
| BMI, kg/m2 |
24.7 ± 4.8 |
23.9 ± 4.0 |
0.031 |
| Smokers, n (%) |
34 (18.1%) |
42 (10.7%) |
0.015 |
| Hypothyroidism, n (%) | 16 (8.5%) | 12 (3.1%) | 0.006 |
Values are mean ± standard deviation; n, numbers of women; BMI, body mass index: BMI at inclusion (cases), BMI at first antenatal visit (controls); Smokers: smoker during ≥1 pregnancy ending with miscarriage (cases), smoker at first visit to the prenatal center in gestational week 10 (controls); Hypothyroidism: elevated serum TSH-levels according to local laboratory limits.