Table 2.
DTI quality and head motion parameters.
| Variable | DCD (n = 28) | DCD + ADHD (n = 25) | |||
|---|---|---|---|---|---|
| Treatment (n = 11) | Waitlist (n = 17) | Treatment (n = 14) | Waitlist (n = 11) | ||
| DTI Quality | |||||
| Contrast-to-Noise Ratio (CNR); Mean (SD) | Scan 1 | 5.7 (1.0) | 4.9 (1.7) | 5.8 (1.8) | *10.2 (8.5) |
| Scan 2 | 5.9 (1.2) | 5.3 (2.0) | 6.8 (4.1) | 7.0 (3.6) | |
| Scan 3 | 5.6 (0.9) | 5.8 (2.5) | 5.5 (1.9) | 6.6 (2.6) | |
| Signal-to-Noise Ratio (SNR); Mean (SD) | Scan 1 | 65.6 (10.0) | 61.0 (11.8) | 65.1 (10.7) | 61.4 (19.9) |
| Scan 2 | 68.6 (8.0) | 67.0 (13.2) | 63.9 (10.0) | 63.9 (14.8) | |
| Scan 3 | 71.7 (6.6) | 65.8 (10.8) | 65.8 (11.9) | 72.4 (7.2) | |
| Head Motion Parameters | |||||
| Average Relative Motion (mm); Mean (SD) | Scan 1 | 0.30 (0.2) | 0.42 (0.2) | 0.44 (0.2) | 0.40 (0.3) |
| Scan 2 | 0.20 (0.1) | 0.45 (0.2) | 0.41 (0.3) | 0.40 (0.3) | |
| Scan 3 | 0.30 (0.2) | 0.30 (0.2) | 0.45 (0.3) | 0.32 (0.13) | |
| Average Absolute Motion (mm); Mean (SD) | Scan 1 | 0.81 (0.5) | 1.20 (1.0) | 1.20 (1.0) | 1.10 (1.4) |
| Scan 2 | 0.83 (0.7) | 1.00 (0.5) | 0.86 (0.6) | 0.80 (0.4) | |
| Scan 3 | 0.73 (0.5) | 0.80 (0.3) | 1.10 (0.9) | 0.90 (0.5) | |
ADHD, attention deficit hyperactivity disorder; DCD, developmental coordination disorder; DTI, diffusion tensor imaging; SD, standard deviation. *p < 0.01: not significant after Bonferroni correction (p < 0.004).