Maternal Hypothyroidism in Early Pregnancy and Infant Structural Congenital Malformations
Table 1
Characteristics of women who reported the use of thyroxin in early pregnancy.
Variable
With thyroxin
In population
OR
95% CI
Maternal age
<20
87
27828
0.31
0.20–0.38
20–24
1331
210254
0.58
0.55–0.62
25–29
5416
485407
1.00
Reference
30–34
9352
531265
1.53
1.48–1.55
35–39
6182
248516
2.10
2.02–2.19
40–44
1560
47018
2.80
2.64–2.98
≥45
93
2014
3.66
2.99–4.48
Parity
1
9247
687283
1.00
Reference
2
9250
562633
1.00
0.97–1.03
3
3696
310094
0.92
0.88–0.96
≥4
1846
92332
0.89
0.84–0.94
Smoking
Unknown
381
95377
—
—
None
22191
1316102
1.00
Reference
<10 cigs/day
1031
100330
0.87
0.72–0.81
≥10 cigs/day
428
40533
0.75
0.68–0.82
BMI
Unknown
1717
192912
—
—
<18.5
349
33624
0.87
0.78–0.97
18.5–24.9
12112
841302
1.00
Reference
25–29.9
6110
336114
1.22
1.18–1.25
30–34.9
2509
106013
1.58
1.52–1.65
≥35
1242
42377
1.93
1.82–2.05
Maternal diabetes
693
8028
5.28
5.01–5.78
Maternal use of thyreostatics
173
401
41.7
36.3–47.5
Maternal use of anticonvulsants
105
4385
1.38
1.14–1.68
Maternal use of antihypertensives
260
5506
2.20
1.94–2.49
Total number
24039
1552342
—
—
Odds ratio (OR) with 95% confidence intervals (95% CI) after adjustment for year of birth and maternal age, parity, smoking, and BMI. Bold figures mark statistical significance.