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Frequency eating chips: number of time units


CHIPNO is a 3-digit-numeric variable.

0: Never or less than 6 times per year
995: 995+
996: Not in Universe
997: Unknown-refused
998: Unknown-not ascertained
999: Unknown-don't know


For sample adults, CHIPNO reports how many times the respondent ate chips in a specified time period. CHIPNO should be used in conjunction with CHIPTP, which reports the corresponding time unit stated by the respondent. For information about the portion size, see CHIPSSIZ.

CHIPNO 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 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.

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 adults age 18+ (excluded from CACT supplement).
  • 1992: Half of sample adults 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