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Table 1 Characteristics of a group of 872 women who delivered at term (≥37 weeks of gestation), comparing spontaneous deliveries and operative vaginal deliveries or secondary CS. Primary CS’s were excluded

From: Increased maternal TSH and decreased maternal FT4 are associated with a higher operative delivery rate in low-risk pregnancies: A prospective cohort study

  All deliveries (872) Spontaneous deliveries (747) Operative deliveries (125) p-value
Mean (SD) N(%) Mean (SD) N(%) Mean (SD) N(%) t-test X2
Age ≥35 yrs 30.5(3.6)   30.6 (3.7)   30.0 (3.4)   0.08
Low education   69 (8)   62 (8)   7 (6) 0.47
BMI before pregnancy(kg/m2) 25.2(4.3)   25.0 (4.2)   26.3(4.7)   0.002
Primiparity   366(42)   268(36)   98 (78) <0.001
Miscarriage in obstetric history   164(19)   148(20)   16 (13) 0.06
Smoking   108(12)   89 (12)   19 (15) 0.30
Thyroid function
12 weeks gestation
 TSH (mIU/L) 1.30 (2.97)   1.21(0.80)   1.88 (0.76)   0.33
 FT4 (pmol/L) 16.2 (2.5)   16.2 (2.5)   16.2 (2.5)   0.98
24 weeks gestation
 TSH (mIU/L) 1.33 (0.69)   1.32(0.65)   1.45(0.89)   0.11
 FT4 (pmol/L) 13.9 (2.0)   13.9 (2.0)   13.7 (1.8)   0.20
36 weeks gestation
 TSH (mIU/L) 1.49 (0.75)   1.46(0.73)   1.63(0.86)   0.025
 FT4 (pmol/L) 13.3 (2.2)   13.4 (2.2)   12.9 (2.1)   0.007
TPO-Ab >35 IU/mL   75 (8.6)   60 (8.0)   15(12.0) 0.14
Family history thyroid dysfunction   158(18)   137(18)   21 (17) 0.80
Neonatal outcome:
Term at delivery (wks) 39.9(1.1)   39.8 (1.1)   40.3 (1.0)   <0.001
Birth weight (gr) 3545(457)   3539(457)   3582(454)   0.33
Male offspring   451(52)   380(51)   71(57) 0.20
  1. *Variables in bold are statistically significant (P < 0.05)