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Description

For sample adults, FBNUM reports the number of full brothers (either alive or dead) of the respondent.

The Manuals for all three years define "full siblings" as people who have "the same biological father and mother." Thus, a respondent's full brother is a brother who has the same biological father and mother as the respondent (i.e., not half-brothers, stepbrothers, adopted brothers, foster brothers, or brothers-in-law).

FBNUM is one of a series of related variables in the "Family History" section of the 2000, 2005, and 2010 Cancer Modules. In all three 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 Manual provides a similar rationale, stating that the collection of this data "will allow analysts a greater understanding of how family history relates to cancer. For a full list of available cancer family history variables relating to full brothers, see the variable description for FBBLCAN, which reports whether the respondent had at least one full brother who ever had bladder cancer.

In addition to questions about full brother(s), the "Family History" section of the 2000, 2005, and 2010 Cancer Modules also included questions about respondents' biological daughter(s), biological son(s), and full sister(s) (i.e., sister(s) with the same biological father and biological mother as the respondent). For each, there is a variable reporting the number of such persons:

• (BDNUM) reports the number of biological sons

• (BSNUM) reports the number of full brothers

• (FSNUM) reports the number of full sisters

Comparability

FBNUM is fully comparable between 2005 and 2010.

FBNUM is largely comparable between 2000 and 2005/2010, though there may be some difference in the meaning of "refused," "not ascertained," and "don't know" as used in 2000 compared to the meanings of those terms in 2005 and 2010.

The Survey Descriptions for all three years caution that while "all sample adults were to be asked the questions in the Cancer Control Module, some persons did not complete the supplement." However, whereas in 2000, persons who answered less than 50 percent of the questions in the supplement had a value of "not ascertained" automatically inserted in the appropriate fields of the Cancer Control Module file, in both 2005 and 2010, persons who answered none of the questions in the supplement had a value of "not ascertained" automatically inserted in the appropriate fields of the Cancer Control Module file.

Universe

Availability

• 1987, 2000, 2005, 2010

Weights

• 1987, 2000, 2005, 2010 : SAMPWEIGHT