Table 3.
Quartiles * of mammographic percent density and UST sound speed by case-control status.
| Case | Control | |||
|---|---|---|---|---|
| (N = 61) | (N = 165) | |||
| N | % | N | % | |
| Quartiles * of MPD, % | ||||
| <7.8 | 10 | 16.4 | 41 | 24.9 |
| 7.8 to <16.9 | 9 | 14.8 | 42 | 25.5 |
| 16.9 to <30.8 | 20 | 32.8 | 40 | 24.2 |
| ≥30.8 | 22 | 36.1 | 42 | 25.5 |
| Quartiles * of VASS, m/s | ||||
| <1440.6 | 3 | 4.9 | 40 | 24.2 |
| 1440.6 to <1445.6 | 11 | 18 | 43 | 26.1 |
| 1445.6 to <1452.8 | 17 | 27.9 | 41 | 24.9 |
| ≥1452.8 | 30 | 49.2 | 41 | 24.9 |
* Quartiles were defined based upon distribution among controls. CI, confidence interval; MPD, mammographic percent density; OR, odds ratio; VASS, volume averaged sound speed.