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Table 3 Comparison of hormone and growth factor levels among 6–8 year old Boston girls after 1 week milk consumption versus 1 week macronutrient substitute for milk (n = 28).

From: Milk consumption and the prepubertal somatotropic axis

Boston   Mean 50th percentile 75th percentile
Growth Hormone (ng/ml) After substitute 0.89 ± 0.96 0.41 1.52
  After milk 1.25 ± 1.67 0.21 1.62
  p-value NA* 0.63 0.93
IGF-I (ng/ml) After substitute 257.26 ± 69.12 250.36 294.71
  After milk 270.60 ± 89.46 250.20 308.77
  p-value 0.35 0.99 0.68
IGF-I/IGFBP-3 After substitute 0.057 ± 0.01 0.057 0.064
  After milk 0.059 ± 0.02 0.056 0.068
  p-value 0.28 0.72 0.28
  1. For means, p-values are from paired t-tests. For 50th and 75th percentiles, p-values are from unpaired quantile regression.
  2. *T-test comparing mean GH is not appropriate, due to non-Normal GH distribution