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Time since last chest xray: Time period

Codes and Frequencies

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For sample persons aged 40 and over who had ever had a chest x-ray, but did not know the month and year of the last x-ray (exact date), CXRAYTIMTP reports the time period (in days, weeks, months or years) since the last chest x-ray.
CXRAYTIMTP should be used in conjunction with CXRAYTIMNO, which reports the number of time units.
CXRAYTIMTP is part of a series of variables introduced in 1992 dealing with adult cancer. For related variables, please use the IPUMS NHIS search function and drop-down menus


There are no comparability issues.


  • 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 ever had a chest x-ray and month of last x-ray was NA AND year of last x-ray was refused/unknown/not ascertained or 1989.


  • 1992