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Recode: frequency eating chips, times per year


CHIPYR is a 4-digit-numeric variable.

0: Never or less than 6 times per year
9996: Not in Universe
9997: Unknown-refused
9998: Unknown-not ascertained
9999: Unknown-don't know


For sample adults, CHIPYR is a recoded variable that reports how many times per year the respondent consumed chips. This recoded variable is based on the responses to CHIPNO, which reports the frequency with which the respondent ate chips and CHIPTP, which reports the corresponding time unit. For information about the portion size, see CHIPSSIZ.

CHIPYR 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.

Prior to 2000, respondents were asked how often they consumed salty snacks like chips or popcorn. The field representative's manual in 1992 specifies that this applies equally to corn chips, potato chips, and pretzels. In 2000, the survey question is exclusively about chips and specifies that this includes regular fat potato chips, tortilla chips, and corn chips. The 2000 survey specifies that non-fat baked chips are not to be included. Low or unsalted versions of these snacks are included. Portion size (CHIPSSIZ) is only available prior to 2000.

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 in 2 weeks of quarter 3 (excluded from CACT supplement).
  • 2000: Sample adults age 18+.


  • 1987, 1992, 2000