Table 1

Urinary iodine (UIC), Thyroglobulin (Tg), TSH, free T4, and free T3 concentration by sex, age, socioeconomic status, and ethnicity in New Zealand children
UIC (μg/L) Tg (μg/L) TSH (mu/L) Free T4 (pmol/L) Free T3 (pmol/L)
n Median 25th,75th Median 25th,75th Mean 95% Cl Mean 95% Cl Mean 95% Cl
Total 1153 68 50,95 12.9 8.1,19.9 1.7 1.6,1.8 14.9 14.6,15.2 6.0 5.9,6.1
Sex
  Male 611 69 50,94 12.6 17.9,19.2 1.7 1.6,1.8 14.8 14.5,15.1 6.0 5.9,6.0
  Female 542 67 55,96 13.4 8.5,20.5 1.7 1.6,1.9 15.0 14.5,15.4 6.0 5.9,6.1
Age
  5-7 yr 315 63 50,88 16.2 10.4,24.2 1.6 1.5,1.8 15.4 14.9,15.8 6.0 5.9,6.1
  8-10 yr 438 67 50,94 12.5 8.0,19.0 1.8 1.7,1.9 15.0 14.6,15.5 6.0 5.9,6.1
  11-14 yr 400 75 51,106 11.1 7.4,16.4 1.7 1.6,1.8 14.4 13.9, 14.9 5.9 5.9,6.1
SES
  Low 567 70 50,98 12.8 8.0,19.9 1.7 1.6,1.8 15.2 14.7,15.7 6.0 5.9,6.2
  Medium 347 68 50,93 12.4 8.0,20.4 1.6 1.5,1.7 15.0 14.5,15.5 5.9 5.9,6.0
  High 239 66 50,93 13.2 9.0,19.2 1.8 1.7,1.9 14.6 14.1,15.1 6.0 5.9,6.2
Ethnicity
  NZEO 333 66 50,93 13.5 8.8,21.2 1.7 1.6,1.8 14.6 14.3,15.0 6.0 5.9,6.1
  Māori 338 67 50,87 13.0 8.3,20.1 1.6 1.5,1.8 15.4 14.9,15.9 6.0 5.9,6.1
  Pacific 482 73 50,105 12.4 7.8,18.0 1.7 1.6,1.8 15.6 15.2,16.1 6.0 5.9,6.2

All data adjusted for sampling weights and presented as median with 25th,75th percentile or mean with 95% Confidence Interval; geometric mean given for TSH. Tg concentration of 5-7 yr was higher than 11-14 yr (P = 0.002), and Tg concentration of 8-10 yr was higher than 11-14 yr (P = 0.031). Free T4 concentration of 5-7 yr higher than 11-14 yr (P = 0.013). Free T4 concentration of NZEO lower than Māori (P = 0.010) and Pacific (P = 0.002). Socioeconomic status = SES, New Zealand European and Other Ethnicities = NZEO.

Skeaff et al.

Skeaff et al. Nutrition Journal 2012 11:31   doi:10.1186/1475-2891-11-31

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