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Time since skin exam: Time period

Codes and Frequencies

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For sample adults who have ever had a skin cancer exam (SKNCANX), SKNXMTP reports the time period (days, weeks, months, years) when the most recent skin exam was done. This variable accompanies SKNXMNO (Time since skin exam: number of units).


Interviewers asked when the "MOST RECENT skin exam" was done and accepted responses given in either a time period or month/year format. Responses given in a time period format were recorded in two variables, SKNXMNO (Time since skin exam: number of units) and SKNXMTP (Time since skin exam: Time period). Responses given in a month/year format were recorded in two variables, SKNXMDMO (Month of most recent skin exam) and SKNXMDYR (Year of most recent skin exam).

The 2000 NHIS Survey Description advises data analysts to use the summary recodes (SKNXMRMO, SKNXMGYR) "rather than the answers to the original sub questions [SKNXMDMO, SKNXMDYR, SKNXMNO, SKNXMTP, SKNXMEYR]" since "the recodes include all respondents who were eligible for the test, while the raw answers applied only to the subset of respondents who gave the time in a particular format."

For more information, please see SKNCANX.


Although the format of the questions varies slightly between years, apart from changes in the universe, SKNXMTP is generally comparable across years. See Survey Text tab.


  • 1992: Half of sample persons age 18+ in quarters 1 and 2, and in 2 weeks of quarter 3 (excluded from CAEP supplement) who ever had a skin cancer exam and month and year of last exam are unknown.
  • 2000; 2005; 2010; 2015: Sample adults age 18+ who ever a had skin cancer exam and answered in number and time period format.


  • 1992, 2000, 2005, 2010, 2015