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Table 1 Maternal thyroid hormone levels during the first 16 weeks of pregnancy

From: Para-occupational exposure to pesticides, PON1 polymorphisms and hypothyroxinemia during the first half of pregnancy in women living in a Mexican floricultural area

Hormone n = 381 (%) Mean ± SDa P10c P50c P90c
 Free T4(ng/dL) b    0.79 ± 0.34 0.48 0.75 0.96
  < 0.76 207 54.3     
  ≥ 0.76 174 45.7     
 TSH (mUI/L) b    1.24 ± 1.30 0.22 0.87 2.58
  ≤ 4 371 97.4     
  > 4 10 2.6     
 Overt hypothyroidismd 7 1.8     
 Sub-Clinical hypothyroidismd 3 0.8     
 Isolated Hypothyroxinemiad 197 51.71     
 Without Hypothyroxinemiae 174 45.67     
  1. aArithmetic mean and Standard Deviation (SD)
  2. bGeometric mean and SD: TSH = 0.83 ± 0.8 mUI/L; Free T4 = 0.75 ± 0.3 ng/dL
  3. c10, 50 and 90 percentiles
  4. dHypothyroxinemia includes: Overt hypothyroidism (TSH concentrations > 4 mlU/L and a free T4 concentration < 0.76 ng/dL); Subclinical hypothyroidism (TSH concentrations >4mlU/L, and a free T4 concentration ≥ 0.76 ng/dL); Isolated hypothyroxinemia (TSH concentrations ≤4 mlU/L and a free T4 concentration < 0.76 ng/dL)
  5. eWithout hypothyroxinemia: a free T4 concentration ≥ 0.76 ng/dL)