Codes and Frequencies
For sample adults aged 18 and older in the Cancer Control supplement sample whose son(s) ever had cancer, BSCLRCAN reports if the person's son or sons had colorectal cancer.
In 2015, due to low frequencies among family members, colon and rectal cancers were removed from the NHIS public use file to maintain respondent confidentiality. Therefore, from 2015 NHIS does not provide colon and rectal cancer variables separately, and instead a series of "colorectal cancer" variables was created. Researchers may choose to recode the colon and rectal cancer variables BSCLCAN and BSRTCAN in 2000, 2005 and 2010 to mimic the "colorectal cancer" variables in 2015.
Researchers should use caution when analyzing this variable and other summary colorectal cancer family history variables for 2015. Please refer to the comparability section for more information.
BSCLRCAN is one of a series of related variables in the "Family History" section 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 this and other 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 these 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, adoptive son, foster son, or son-in-law).
- 2015: Sample adults aged 18 and older whose son(s) were ever diagnosed with cancer.
- 2015 : SAMPWEIGHT