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Reason for proctoscopic exam

Codes and Frequencies

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For sample persons/adults age 40 and over who have had a proctoscopic exam, PROCEXWHYreports the main reason for the exam.

For related variables, please use the IPUMS NHIS search function and drop-down menus.


Apart from changes in the universe, this variable is mostly comparable over time. 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.


  • 1992: Half of sample persons age 40+ in quarters 1 and 2 and in 2 weeks of quarter 3 (excluded from CAEP supplement) who have heard of a proctoscopic exam, have had a proctoscopic exam, and whose most recent exam was in past 3 years.
  • 1998: Sample adults age 40+ who have had a proctoscopic exam.


  • 1992, 1998