BSAUKCAN is a two-digit count variable.
21: Top code of 21 or more
96: Not in Universe
98: Unknown-Not Ascertained
99: Unknown-Don't Know
For sample adults with at least one biological son (BSNUM) who ever had an unknown kind of cancer (BSUKCAN), BSAUKCAN reports the number of the respondent's biological sons who were under 50 years of age when the unknown kind of cancer was first diagnosed.
Although BSAUKCAN is only available in 2000, the broader series of related questions about cancer "Family History" were part of the 2000 and later Cancer Modules. In all years, this section begins with the general comment:
According to the 2000 and 2005 Field Representative's Manuals, the purpose of these family cancer history questions is to "determine the prevalence of cancer in families in the population" to "allow a greater understanding of how data obtained from genetics clinics can be applied to the general population." The 2010 and later Manuals provide a similar rationale, stating that the collection of this data "will allow analysts a greater understanding of how family history relates to cancer."
The Manuals for all years define "biological" relatives as people related by blood. Thus, a respondent's biological son is a son related to the respondent by blood (i.e., not a stepson, adopted son, foster son, or son-in-law).
- 2000: Sample adults age 18+ whose son(s) ever had unknown kind of cancer.
- 2000 : SAMPWEIGHT