Table 1: Demographic and laboratory characteristics of patients.

Group I ( ) Group II ( ) Group III ( )

Maternal age (median; min–max) 31 (25–39) 29.5 (29–39) 31 (29–44) 0.6
Parity (primipar/multipar) 3/10 7/14 37/55 0.4
Previous abortus history (%) 4 (26.7) 1 (4.5) 11 (12) 0.2
Previous preterm birth (%) 3 (20) 0 0 *
Current preterm delivery (%) 9 (60) 6 (27.3) 17 (18.5) 0.002
Multiple pregnancy (%) 4 (26.7) 2 (9.1) 13 (14.1) 0.3
Maternal TSH** (median; min–max)5 (0.9–14)2.7 (0.2–18.9)1.8 (1.1–3.1)<0.001
Maternal FT4** (median; min–max)1.1 (0.7–1.7)0.9 (0.1–1.6)1.2 (1–1.7)<0.001
Birth weight (gram) (median; min–max) 2840 (970–3600) 3180 (1700–4230) 3140 (1200–4550) 0.3
Gestational age (week) (median; min–max) 36.5 (29–38) 38 (32–40) 38 (29.5–41) 0.002
Sex (female/male) (%) 33.3/66.7 40.9/59.1 54.3/45.6 0.1
Intrauterine growth retardation (%)2 (15.4)1 (4.8)8 (8.8)0.6
NICU admission (%) 6 (46.7) 8 (31.8) 3 (3.3) <0.001

Statistical analysis inapplicable.
**Measurements were obtained at 3rd trimester.