Summary of Key Variables in Summer and Winter
| Variable | Summer | Winter | P |
| Dose (mean) | 274.6 MBq | 269.0 MBq | 0.533 |
| Age (mean) | 68.3 y | 67.2 y | 0.738 |
| Sex | 38.9% female | 44.4% female | 0.712 |
| Average liver counts per pixel (mean) | 2.92 | 3.17 | 0.495 |
| Maximum liver counts per pixel (mean) | 5.37 | 5.35 | 0.979 |
| Average heart counts per pixel (mean) | 3.00 | 4.11 | 0.031 |
| Maximum heart counts per pixel (mean) | 5.36 | 7.33 | 0.024 |