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Table 2 Mode of delivery in 872 women at term in whom labour started spontaneouslyANOVA analyses for influence of maternal thyroid function at every trimester on mode of delivery (df = 3)

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

  Spontaneous delivery Failure to progress in 1st stage of labour (prolonged dilatation) Failure to progress in 2nd stage of labour (prolonged expulsion) Fetal distress P
  N = 699 (80.2 %) N = 51 (5.8 %) N = 69 (7.9 %) N = 53 (6.1 %)  
12 weeks gestation
 TSH(mIU/L) mean(SD) 1.20 (0.80) 1.21 (0.63) 2.01 (0.92) 1.21 (0.79) 0.010
 FT4(pmol/L) mean(SD) 16.2 (2.75) 16.4 (1.98) 15.5 (2.60) 16.6 (2.23) 0.070
24 weeks gestation
 TSH(mIU/L) mean(SD) 1.31 (0.65) 1.38 (0.68) 1.53 (0.85) 1.35 (0.65) 0.093
 FT4(pmol/L) mean(SD) 13.9 (2.0) 13.6 (1.6) 13.5 (1.7) 14.2 (2.0) 0.16
36 weeks gestation
 TSH(mIU/L) mean(SD) 1.46 (0.73) 1.48 (0.74) 1.71 (0.96) 1.57 (0.68) 0.066
 FT4(pmol/L) mean(SD) 13.4 (1.9) 13.4 (2.2) 12.7 (1.9) 13.3 (2.1) 0.080