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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)