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Frequency eating mayo/dressing, time period

Codes and Frequencies

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For sample adults, MAYODRTP reports the time unit (day, week, month, or year) that corresponds with the frequency with which the respondent reported eating mayonnaise or salad dressing. This includes dressing on salads as well as on sandwiches. MAYODRTP should be used in conjunction with MAYODRNO, which reports the corresponding frequency stated by the respondent. For information about the portion size, see MAYOSIZ.

MAYODRTP is part of a series of variables initiated in 1987 related to food, food knowledge, and cancer. For related variables, please use the IPUMS NHIS search function and drop-down menus.


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 (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.

Special instructions in the field representative's manual differ slightly between survey years. The 1992 field representative's manual indicates that respondents should include low-fat or non-fat dressings or mayonnaise; however, all other survey years specify not to include these. Beginning in 2000, interviewers were instructed to also include salad dressing used as dip.

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 IHIS 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 of quarter 3 (excluded from CACT supplement).
  • 2000: Sample adults age 18+.


  • 1987, 1992, 2000