Table 2.
Test–retest statistics for 11C-raclopride BPND measurements performed approximately seven months apart.
| Baseline | Follow-up | VAR (%) | min; max | ICC | r | |||
|---|---|---|---|---|---|---|---|---|
| Mean (SD) | CV (%) | Mean (SD) | CV (%) | mean (SD) | ||||
| Caudate | 2.276 (0.306) | 13.4 | 2.215 (0.283) | 12.8 | 6.4 (4.6) | 0.4; 16.7 | 0.91 | 0.82 |
| Putamen | 3.384 (0.336) | 9.9 | 3.326 (0.290) | 8.7 | 4.1 (3.4) | 0.3; 12.9 | 0.91 | 0.82 |
| Hippocampus | 0.267 (0.052) | 19.5 | 0.264 (0.048) | 18.2 | 7.7 (5.3) | 0.0; 27.4 | 0.95 | 0.91 |
| Amygdala | 0.393 (0.049) | 12.5 | 0.393 (0.051) | 13.0 | 6.7 (6.1) | 0.0; 21.7 | 0.86 | 0.74 |
| Pallidus | 1.384 (0.149) | 10.8 | 1.352 (0.142) | 10.5 | 6.0 (4.7) | 0.7; 18.4 | 0.85 | 0.75 |
| Thalamus | 0.486 (0.059) | 12.1 | 0.487 (0.054) | 11.1 | 4.7 (3.4) | 0.0; 11.5 | 0.94 | 0.90 |
| Orbitofrontal | 0.249 (0.046) | 18.5 | 0.255 (0.044) | 17.3 | 7.0 (6.0) | 0.0; 20.5 | 0.93 | 0.88 |
| ACC | 0.256 (0.047) | 18.4 | 0.261 (0.038) | 14.6 | 7.0 (4.7) | 0.0; 16.0 | 0.93 | 0.83 |
| Sup. frontal | 0.193 (0.045) | 23.3 | 0.192 (0.036) | 18.8 | 8.2 (6.5) | 0.0; 24.5 | 0.93 | 0.88 |
| Mid. frontal | 0.227 (0.042) | 18.5 | 0.226 (0.037) | 16.4 | 5.3 (3.9) | 0.0; 13.4 | 0.96 | 0.93 |
| Inf. frontal | 0.208 (0.051) | 24.5 | 0.207 (0.050) | 24.2 | 7.9 (8.4) | 0.0; 29.7 | 0.95 | 0.92 |
| Temporal | 0.277 (0.038) | 13.7 | 0.283 (0.038) | 13.4 | 4.9 (3.8) | 0.0; 16.3 | 0.95 | 0.91 |
CV: coefficient of variance; ICC: intraclass correlation coefficient; max: maximum; min: minimum; r: Pearson's correlations coefficient (adjusted for gray-matter volume); SD: standard deviation; VAR: absolute variability.
Note: p > 0.05 for comparisons of mean values between sessions.