Table 1. Subgroup analysis for the correlation between FDG uptake and Ki-67 index in breast cancer
| Subgroup | N | r value (95% CI) | P value |
| Study design | |||
| Prospective | 11 | 0.41 (0.34, 0.47) | P>0.05 |
| Retrospective | 11 | 0.43 (0.36, 0.50) | |
| Modality | |||
| PET/CT | 18 | 0.40 (0.35, 0.45) | P<0.05 |
| PET | 4 | 0.52 (0.41, 0.64) |