TABLE 2.
Descriptive statistics of dependent measures for stop-signal task behavioral data overall and per group.
| Dependent Measure | Group | M | SD | Range |
| Probability of go omissions (no response) | DCD | 0.02 | 0.03 | 0–0.07 |
| ADHD | 0.04 | 0.04 | 0–0.14 | |
| DCD + ADHD | 0.03 | 0.04 | 0–0.1 | |
| Control | 0.02 | 0.02 | 0–0.08 | |
| Overall | 0.03 | 0.03 | 0–0.14 | |
| Probability of choice errors on go trials | DCD | 0.04 | 0.03 | 0–0.1 |
| ADHD | 0.04 | 0.04 | 0–0.13 | |
| DCD + ADHD | 0.07 | 0.05 | 0.02–0.14 | |
| Control | 0.03 | 0.02 | 0–0.09 | |
| Overall | 0.04 | 0.03 | 0–0.14 | |
| RT on go trials (mean) | DCD | 663.64 | 107.25 | 491.25–842.05 |
| ADHD | 618.46 | 167.22 | 402.91–837.31 | |
| DCD + ADHD | 654.59 | 197.17 | 496.53–988.59 | |
| Control | 672.49 | 151.75 | 407.1–904.31 | |
| Overall | 656.73 | 147.31 | 402.91–988.59 | |
| Intra-subject variability of correct go trials | DCD | 133.40 | 35.80 | 67.43–191.7 |
| ADHD | 120.17 | 47.27 | 49.42–192.59 | |
| DCD + ADHD | 114.68 | 35.26 | 80.69–167.44 | |
| Control | 122.37 | 39.98 | 54.47–184.19 | |
| Overall | 122.76 | 39.12 | 49.42–192.59 | |
| Probability of responding on a stop trial | DCD | 0.50 | 0.03 | 0.45–0.59 |
| ADHD | 0.49 | 0.02 | 0.45–0.51 | |
| DCD + ADHD | 0.48 | 0.03 | 0.43–0.51 | |
| Control | 0.48 | 0.03 | 0.44–0.56 | |
| Overall | 0.49 | 0.03 | 0.43–0.59 | |
| Average stop-signal delay | DCD | 377.79 | 124.27 | 143.18–574.17 |
| ADHD | 359.58 | 155.08 | 170.18–557.71 | |
| DCD + ADHD | 374.36 | 204.97 | 141.18–674.2 | |
| Control | 413.00 | 148.26 | 141.17–656.19 | |
| Overall | 389.00 | 147.96 | 141.17–674.20 | |
| Stop-signal reaction time | DCD | 286.24 | 72.18 | 228.29–479.07 |
| ADHD | 256.02 | 30.75 | 226.54–320.42 | |
| DCD + ADHD | 275.51 | 47.19 | 231.08–358.23 | |
| Control | 254.34* | 43.42 | 200.4–413.9 | |
| Overall | 264.13 | 50.29 | 200.40–479.07 | |
| RT of go responses on unsuccessful stop trials | DCD | 569.30 | 70.75 | 458.94–690.85 |
| ADHD | 545.09 | 149.42 | 373.3–811.73 | |
| DCD + ADHD | 575.60 | 188.01 | 424.23–903.2 | |
| Control | 583.06 | 129.95 | 379.44–813.99 | |
| Overall | 570.77 | 126.75 | 373.30–903.20 |
Measures listed as recommended by Verbruggen et al. (2019), including measures for each group and overall. The SSRT was not estimated for n = 5 participants exhibiting suboptimal performance. An additional table is included in Supplementary Materials listing descriptive measures for these participants. When outliers were removed on a trial-by-trial basis, group level differences did not change. *Not normally distributed.