Gestational age at delivery

Hypothyroid

P value

Overt

N = 47

Subclinical

N = 283

28 to 34 weeks

4

(8.5%)

4

(1.4%)

0.001

34 - 36 weeks 6 days

10

(21.2%)

28

(9.8%)

Term

33

(70.2%)

251

(88.6%)