Table 2 Joint frequency quartile distribution for the number of observations (n) per-quartile for the percent density measurements (PD) from the raw (vertical) and processed (horizontal) image representations.
From: Comparison of percent density from raw and processed full-field digital mammography data
PD (processed) | |||||
|---|---|---|---|---|---|
PD (raw) | Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | n |
[0.0, 9.2) | [9.2, 18.1) | [18.1, 26.3) | [26.3, 100) | ||
Quartile 1 | 52 | 16 | 2† | 1† | 71 |
[0.0, 5.5) | |||||
Quartile 2 | 19 | 51 | 21 | 3† | 94 |
[5.5, 14.7) | |||||
Quartile 3 | 3† | 28 | 40 | 21 | 92 |
[14.7, 26.9) | |||||
Quartile 4 | 1† | 2† | 26 | 74 | 103 |
[26.9, 100) | |||||
n | 75 | 97 | 89 | 99 | 360 |