HWWTAPCTRM is a 5-digit numeric variable with 2 implied decimal places.
99997 = Flagged cases
99998 = Missing
99999 = NIU (not in universe)
For surviving children born in the three to five years before the survey, HWWTAPCTRM (HW9) reports the child's weight-for-age as a percent of the median weight for a reference population of the same age and sex. For this variable, the reference population was developed by the U.S. Centers for Disease Control. Low child weight-for-age, or "underweight," is an indicator of acute and/or chronic malnutrition,
The similar variable HWWTAPCT (HW7) reports the child's weight-for-age percentile relative to smoothed percentile growth charts by age and sex, for the same reference population.
For an alternative measure of child stunting in terms of weight-for-age and using the same reference population, see HWWAZNCHS (HW8). HWWAZNCHS reports the difference between the child's height and the median weight of the CDC reference population of the same age and sex, expressed in units equal to one standard deviation of the reference population's distribution.