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Time born earlier or later than expected: Recode 1

Codes and Frequencies

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For sample persons under age 18 in 1988, and sample persons under age 18 whose respondent is their biological parent in 1981, BORNDIFTIM1 indicates if the person was born earlier, later, or about when expected, in number of weeks. This variable reports the timing of birth in a series of pre-specified time intevals. Please see the Codes tab for additional information about possible responses.

This variable is part of the 1981 and 1988 Child Health Supplement. Please use the IPUMS NHIS drop-down menus and search function to find other variables related to this supplement.


The 1981 and 1988 Child Health Supplement collected information about children 17 years of age and younger on a wide range of topics, including: family structure, child care, breastfeeding, development, medications, birth and prenatal events, hospitalizations and surgery, chronic conditions, weight, school, behavior problems, social issues, and sleep habits. All questions were asked of the adult best able to provide accurate information about the child. The preferred respondents for this supplement, in order of priority, are: biological mother, biological father, an adoptive, step, or foster parent, a legal guardian, a primary caretaker, or another adult.


There are no comparability issues with this variable.


  • 1981: Sample persons under age 18, whose respondent is their biological parent.
  • 1988: Sample persons under age 18.


  • 1981, 1988