TABLE 4.
Parametric and smooth terms for the best‐fitting models for the stop trial parameters.
| Parametric coefficients | SSRT | muS | sigmaS | tauS | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Est.(SE) | t | p | Est.(SE) | t | p | Est.(SE) | t | p | Est.(SE) | t | p | |
| Intercept | 326.11 (12.81) | 25.46 | <.001 | 166.94 (7.77) | 21.50 | <.001 | 182.51 (10.45) | 17.47 | <.001 | 143.26 (7.33) | 19.54 | <.001 |
| Group | −38.00 (12.79) | −2.97 | <.001 | −19.57 (7.75) | −2.52 | 0.01 | −22.51 (10.43) | −2.16 | 0.03 | −17.16 (7.32) | −2.34 | .02 |
| SES_c | −0.27 (0.14) | −1.88 | .06 | −0.12 (0.09) | −1.37 | 0.17 | −0.04 (0.12) | −0.32 | .75 | −0.15 (0.08) | −1.80 | .07 |
| med | −32.21 (17.78) | −1.81 | .07 | −17.88 (10.84) | −1.65 | 0.10 | −22.45 (14.58) | −1.54 | .12 | −13.64 (10.19) | −1.34 | .18 |
| Sex | 7.97 (12.67) | 0.63 | .53 | −0.41 (7.68) | −0.05 | 0.96 | 13.20 (10.34) | 1.28 | .20 | 7.12 (7.12) | 0.98 | .33 |
| Smooth terms | Edf (Ref.df) | F | p | Edf (Ref.df) | F | p | Edf (Ref.df) | F | p | Edf (Ref.df) | F | p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| s(age_c) | 1.00 (1.00) | 34.50 | <.001 | 1.00 (1.00) | 5.57 | 0.02 | 1.01 (1.01) | 28.84 | <.001 | 1.00 (1.00) | 44.22 | <.001 |
| s(SID) | 76.74 (255.00) | 0.45 | <.001 | 30.70 (255.00) | 0.14 | 0.11 | 39.19 (255.00) | 0.19 | 0.04 | 71.94 (255.00) | 0.41 | <.001 |
Note: Est.: estimated regression parameter; SE: standard error; edf: estimated degrees of freedom; Ref.df: reference degrees of freedom; group: ADHD and controls; SES_c: mean‐centred SES; med: medication status; sex: males and females; s(age_c): smoothed mean‐centred age; s(SID): subject ID entered as a random effect. SSRT: stop‐signal reaction time; muS: Mu of the stop‐signal reaction time distribution; sigmaS: Sigma of the stop‐signal reaction time distribution; tauS: Tau of the stop‐signal reaction time distribution. Bold indicates significance.