Table 1 Summary description of studies
|  | Total number of studies | Number of studies by breast cancer outcomeΨ | |
|---|---|---|---|
(n=31) | Incidence/risk | Mortality | |
(n=27) | (n=7) | ||
Publication years | Â | Â | Â |
2010-2013* | 9 | 6 | 3 |
2000-2009 | 11 | 11 | 1 |
1990-1999 | 9 | 9 | 2 |
1980-1989 | 1 | 1 | 0 |
1970-1979 | 1 | 0 | 1 |
Study design | Â | Â | Â |
Cross-sectional | 25 | 23 | 5 |
Longitudinal | 4 | 2 | 2 |
Case–control | 2 | 2 | 0 |
Country | Â | Â | Â |
U.S.± | 23 | 21 | 3 |
Canada± | 3 | 3 | 0 |
U.K. | 2 | 2 | 1 |
Australia | 2 | 1 | 2 |
Italy | 1 | 1 | 0 |
Switzerland | 1 | 0 | 1 |
Geographic unit | Â | Â | Â |
Census tract | 8 | 8 | 0 |
Census block group | 8 | 8 | 0 |
County | 5 | 4 | 3 |
Zip/Postal code | 3 | 3 | 0 |
Other | 7 | 9 | 4 |
Racial composition | Â | Â | Â |
White/European | 11 | 10 | 1 |
African American/Black | 9 | 8 | 1 |
Hispanic | 7 | 7 | 0 |
Asian/Pacific Islanders | 5 | 5 | 0 |
American Indian/Native Alaskan | 1 | 1 | 0 |
Other | 2 | 2 | 0 |
No data | 18 | 16 | 6 |