Table 1 Summary of collected data from 2020 to 2023.
From: Breast density classification using frequency-based features in microwave imaging
Hospital | Year | Number of patients | Number of samples | Age range | Reference standard, i.e. the radiologic study output | |
|---|---|---|---|---|---|---|
Low density (LD) | High density (HD) | |||||
Hospital 1 | 2020 | 180 | 352 | 20–78 | 177 | 175 |
2023 | 106 | 203 | 18–77 | 87 | 116 | |
Hospital 2 | 2020 | 110 | 217 | 19–78 | 130 | 87 |
2023 | 130 | 252 | 27–79 | 118 | 134 | |
Hospital 3 | 2020 | 63 | 125 | 22–77 | 53 | 72 |
Hospital 4 | 2023 | 24 | 48 | 31–87 | 17 | 31 |
Total | – | 613 | 1197 | 18–87 | 582 | 615 |
