DON'T KNOW MONTH 98
DON'T KNOW YEAR 9998
NIU (not in universe)
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
BIRTHMONTHLT5 (HC30) reports the calendar month of birth of household members under age 5 who were potential subjects for height and weight measurement.
The complementary variable BIRTHYEARLT5 (HC31) reports the household member's calendar year of birth. BIRTHCMCLT5 (HC32) reports the century month code for the household member's date of birth.
Child biometrics, general Variables -- TOPICS