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Frequency eating bread: time period

Codes and Frequencies

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For sample adults, BREADTP reports the time unit (day, week, month, or year) that corresponds with the frequency with which the respondent reported eating whole grain bread. BREADTP should be used in conjunction with BREADNO, which reports the corresponding frequency stated by the respondent. For information about the portion size, see DARBREDSIZ.

BREADTP is part of a series of variables initiated in 1987 related to food, food knowledge, and cancer.


Prior to 2000, respondents were asked about foods they usually ate in the past year. Beginning in 2000, this recall period was reduced to foods the respondent usually ate in the past month. The structure of the responses beginning in 2000 excluding 2005 (recording number of times a food was consumed and the time unit associated with that frequency) makes it possible to compare response categories even with different recall periods. In 2005, this format of separate frequency and time units was not used; instead respondents' answers were organized into pre-defined categories. Researchers interested in using all years of available data may consider seeing the 2005 variable BREADMO, and modifying BREADNO and BREADTP to correspond to the pre-defined categories from 2005.

Data users wishing to combine BREADMO with BREADNO and BREADTP should be aware that prior to 2000, bread products were differentiated by white bread or dark bread; the survey text specifies that dark breads are breads like whole wheat, rye, or pumpernickel. The 1987 field representative's manual indicates that dark bread also includes any whole wheat products listed under the white bread category (e.g., biscuits or bagels). Beginning in 2000, the survey only asked about whole grain bread and specified that this includes whole wheat, rye, oatmeal, and pumpernickel as well as cracked wheat, multi-grain, and bran breads. Please see the Survey Text tab for the exact phrasing of each year's question.

Changes in survey design (e.g., quarters in which the supplement was collected) may affect raw frequencies, but do not affect comparability of the variable. As always, data users should use the prescribed IPUMS NHIS weights.


  • 1987: Half of sample persons age 18+ (excluded from CACT supplement).
  • 1992: Half of sample persons age 18+ in quarters 1 and 2 and 2 weeks in quarter 3 (excluded from CACT supplement).
  • 2000; 2010; 2015: Sample adults age 18+.


  • 1987, 1992, 2000, 2010, 2015