Table 3.
Self-reported Jewish ancestry vs. estimated Ashkenazi Jewish genetic ancestry in 1,967 BRCA carriers.
| Likely last fully Ashkenazi Jewish ancestor | % calculated Ashkenazi Jewish genetic ancestry | Self-reported Jewish ancestry | Did not self-report Jewish ancestry |
|---|---|---|---|
| Self | 85–100% | 972 | 10 |
| 1 parent or 2–3 grandparents | 40–84% | 419 | 41 |
| 1 grandparent | 20–39% | 88 | 29 |
| 1 grandparent or great-grandparent | 10–19% | 33 | 34 |
| 1 great-grandparent | 5–9% | 7 | 17 |
| More distant than great-grandparent | 1–4% | 24 | 127 |
| No detectable Ashkenazi Jewish ancestry | 0% | 9 | 157 |