In 2007, the WHO also released charts for monitoring increasing prevalence of unhealthy weights, raising the growth of older children and adolescents that had the growth curves, leading to under-identification of been updated and improved to take into account the overweight individuals and over-identification of growing epidemic of childhood obesity. [...] Nutritional status: the condition or state of the body in relation to the matters influenced by the diet; the levels of nutrients in the body and the ability of those levels to maintain normal metabolic integrity, including growth in children. [...] For comparison purposes, the 50th percentile is equal to a z-score of 0, the 15th and 85th percentiles approximate z-scores of -1 and +1 respectively, the 3rd and 97th percentiles approximate z-scores of -2 and +2 respectively, and the 1st and 99th percentiles approximate z-scores of -3 and +3, respectively. [...] The reconstructed charts for the newer CDC charts, the WHO reduced the influence of school-aged children and adolescents have been named rising obesity rates over time because data for the 1977 the WHO Reference 2007, and are being adopted by NCHS charts were collected between 1963-1974, before countries concerned about the growing problem of the onset of the obesity epidemic. [...] Because the growth of children in the WHO centile or z-score curve.45 The biggest differences occur Growth Study was optimal, on average, children in the during the first 24 months, likely due to differences in WHO Child Growth Standards are somewhat taller than study design and sample characteristics, such as type of those in the CDC reference.