A growth chart is a plot of the percentiles of growth measurements, such as weig

Question

A growth chart is a plot of the percentiles of growth measurements, such as weight and height, for a population of infants or children. It is used by pediatricians to assess a child's growth over time The Centers for Disease Control and Prevention (CDC) is a U.S. agency devoted to the protection and promotion of public health. Through one of its units, the National Center for Health Statistics (NCHS), the CDC has developed growth charts for clinical use by health professionals. The most recent charts were published in 2000 The 2000 CDC growth charts were developed using a reference population of infants. A pediatrician looks up one of the charts and finds that the 95th percentile for weights of baby girls at 5-1/2 months is 20.4 pounds. This means that of the 5-1/2-month-old baby girls in the reference population weigh The 2000 CDC growth charts use a reference population of both breast-fed and formula-fed infants. It has been observed they tend to weigh less than formula-fed babies from 6 to 12 months Sarah is a healthy baby who was exclusively breast-fed for her first 12 months. Which of the following is most likely a that breast-fed babies tend to gain weight more rapidly than formula-fed babies in the first 2 to 3 months of their lives, but description of her weights (at 3, 6, 9, and 12 months of age) as percentiles of the CDC growth chart reference population? O 70th percentile at 3 months; 40th percentile at 6 months; 30th percentile at 9 months; 25th percentile at 12 months O 20th percentile at 3 months; 50th percentile at 6 months; 80th percentile at 9 months; 90th percentile at 12 months O 80th percentile at 3 months; 80th percentile at 6 months; 80th percentile at 9 months; 90th percentile at 12 months O 40th percentile at 3 months; 40th percentile at 6 months; 40th percentile at 9 months; 40th percentile at 12 months

Explanation / Answer

The 2000 CDC growth charts were developed using a reference population of infants. A pediatrician looks up one of the charts and finds that 95th percentile for weights of baby girls at 5-1/2 months is 20.4 pounds. This means that 95 (out of 100) baby girls at the 5-1/2 month age in the reference population will weigh at the most 20.4 pounds.

Sarah is a healthy baby who was exclusively breast-fed for her first 12 months. Which of the following is most likely a description of her weights (at 3,6,9 and 12 months of age) as percentiles of the CDC growth chart reference population?

70th percentile at 3 months; 40th percentile at 6 months; 30th percentile at 9 months; 25th percentile at 12 months.

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