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Table 3 Percentiles for fT4 (pmol/L) of children and adolescents in different age groups.

From: Pediatric reference intervals for thyroid hormone levels from birth to adulthood: a retrospective study

Age n percentiles
   2.5 10 25 50 75 90 97.5
0 – 1 months 23 8.50 8.98 13.50 20.10 24.70 28.48 30.50
1–12 months 45 9.17 13.10 14.00 15.50 17.20 19.22 25.28
1–5 Years 229 10.45 12.80 14.15 15.70 17.90 19.70 22.35
6–10 Years 327 10.60 12.80 14.40 15.90 17.30 18.90 20.90
11–14 Years 364 10.40 12.15 13.40 15.20 16,80 19.05 21.36
15–18 Years 233 10.57 11.74 13.50 15.20 16.90 18.80 22.62