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Time since last chest xray: Months


CXRAYTIMMO is a 3-digit-numeric variable.

0: Less than 1 month
900: 900+ months
901: Less than 1 year, unknown specific
902: 1 to 3 years, unknown specific
903: 3+ years, unknown specific
904: Less than 3 years. unknown specific
905: Over 3 years, unknown specific
996: Not in Universe
999: Unknown


For sample persons aged 40 and over who had ever had a chest x-ray, CXRAYTIMMO reports number of months since the last chest x-ray.

CXRAYTIMMO 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.


  • 1992