Table 2.
Summary statistics of experimental parameters.
| T1 | ||||||
|---|---|---|---|---|---|---|
| MA (n = 30) | HC (n = 24) | Test value a | p | d | ||
| Sustained Attention | ||||||
| errors | 8.93 ± 19.10 | 10.79 ± 37.02 | -0.238 | .812 | −0.07 | |
| omissions | 10.63 ± 8.48 | 4.00 ± 3.65 | 3.569 | .001 | 0.98 | |
| response time (ms) | 558 ± 130 | 515 ± 118 | 1.252 | .216 | 0.34 | |
| Delay Discounting | ||||||
| log[k] | −2.2 ± 2.3 | −3.9 ± 2.1 | 2.565 | .013 | 0.70 | |
| log[β] | −1.6 ± 1.8 | −1.9 ± 1.5 | 0.808 | .423 | 0.22 | |
| deliberation time (s) | 2.2 ± 0.8 | 2.0 ± 0.6 | 0.935 | .354 | 0.26 | |
| T2 | ||||||
| MA (n = 19) | HC (n = 17) | Test value a | p | |||
| Sustained Attention | ||||||
| errors | 4.77 ± 5.31 | 5.61 ± 14.32 | −0.231 | .818 | −0.08 | |
| omissions | 5.44 ± 7.16 | 4.11 ± 4.93 | −0.650 | .520 | 0.22 | |
| response time (ms) | 504 ± 107 | 535 ± 124 | −0.796 | .434 | −0.26 | |
| Delay Discounting | ||||||
| log[k] | −2.3 ± 2.4 | −4.1 ± 1.7 | 2.451 | .021 | 0.86 | |
| log[β] | −1.8 ± 1.1 | −1.7 ± 1.0 | −0.451 | .655 | −0.15 | |
| deliberation time (s) | 1.8 ± 0.6 | 1.9 ± 0.5 | −1.011 | .322 | −0.34 | |
MA, methamphetamine patients; HC, healthy controls; d, Cohen’s d; log[k], discounting parameter; log[β], consistency parameter.
a
t (paired t-test).
In bold: significant at p < 0.05.