Ages 9 through 13 Years. The prevalence of goiter was estimated in European boys and girls aged 6 to 15 years (Delange et al., 1997). Goiter prevalence in a population increases inversely with iodine intake. Because iodine deficiency is rare in the United States, data from Europe are used to relate goiter, as determined by ultrasound, to urinary iodine excretion. As urinary iodine excretion increases, the goiter prevalence decreases and eventually changes only slightly (Figure 8-1). Although data from this figure are not available for estimating a 50 percent prevalence of goiter, the level of urinary iodine concentration at which there is only a 2 percent prevalence
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8 Iodine ."
Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.