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Table 2 Mean thyroid stimulating hormone and free T4 levels based on subject BMI group

From: Elevated serum TSH concentrations are associated with higher BMI Z-scores in southern Iranian children and adolescents

    Underweight Healthy weight Overweight Obese P
All ages All (850) TSH 2.89 ± 1.64 3.05 ± 1.85 3.22 ± 1.77 3.53 ± 2.13 0.005*
FT4 1.41 ±
0.24
1.43 ±
0.25
1.39 ±
0.27
1.39 ±
0.26
0.221
Male (365) TSH 2.78 ±
1.55
3.16 ±
1.77
3.145 ±
1.69
3.75 ± 1.94 0.002*
FT4 1.41 ± 0.23 1.41 ± 0.24 1.30 ± 0.26 1.42 ± 0.23 0.040*
Female (485) TSH 3.02 ± 1.75 3.00 ± 1.90 3.27 ± 1.83 3.31 ± 2.28 0.457
FT4 1.40 ± 0.25 1.44 ± 0.26 1.44 ± 0.26 1.36 ± 0.28 0.045*
2–9 year olds All (429) TSH 2.79 ± 1.58 2.98 ±
1.62
3.24 ±
1.83
3.64 ±
2.18
0.005*
FT4 1.44 ± 0.25 1.45 ± 0.24 1.44 ± 0.25 1.40 ± 0.27 0.450
Male (155) TSH 2.71 ± 1.66 3.34 ± 1.84 2.23 ± 1.37 4.05 ± 1.82 0.003*
FT4 1.45 ± 0.24 1.47 ± 0.21 1.44 ± 0.19 1.43 ± 0.23 0.872
Female (274) TSH 2.88 ± 1.50 2.81 ± 1.48 3.43 ± 1.86 3.37 ± 2.36 0.084
FT4 1.42 ± 0.25 1.44 ± 0.25 1.44 ± 0.26 1.38 ± 0.29 0.504
10-18 year olds All (421) TSH 3.03 ± 1.72 3.15 ± 2.10 3.21 ± 1.74 3.44 ± 2.09 0.521
FT4 1.36 ± 0.23 1.41 ± 0.27 1.36 ± 0.27 1.38 ± 0.25 0.463
Male (210) TSH 2.88 ± 1.41 2.99 ± 1.70 3.33 ± 1.70 3.58 ± 2.00 0.138
FT4 1.36 ± 0.21 1.36 ± 0.26 1.27 ± 0.26 1.41 ± 0.23 0.057
Female (211) TSH 3.24 ± 2.11 3.26 ± 2.34 3.09 ± 1.80 3.24 ± 2.20 0.984
FT4 1.36 ± 0.25 1.44 ± 0.27 1.44 ± 0.26 1.34 ± 0.27 0.087
  1. Abbreviations: BMI, body mass index; TSH, thyroid stimulating hormone; FT4, free T4
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