Impact of stimulant medication on behaviour and executive functions in children with attention-deficit/hyperactivity disorder

Table 4 Neuropsychological Test Performance Scores measured over the three-time points

Variable	BL T-score mean ± SD (n = 37)	BD T-score mean ± SD (n = 33)	BD-BL (P value)	FU T-score mean ± SD (n = 18)	FU-BD (P value)
CPT omission errors (T-Score)	61.11 ± 15.76	52.88 ± 8.09	P = 0.001	49.34 ± 5.90	P = 0.10
CPT commission errors (T-Score)	53.59 ± 6.74	49.70 ± 11.75	P = 0.097	49.69 ± 10.17	P = 0.04
Digit Span Backwards	95.54 ± 11.04	99.19 ± 11.48	P = 0.059	96.94 ± 15.54	P = 0.055
Spatial Span Backwards	105.68 ± 12.42	108.23 ± 13.0	P = 0.332	108.06 ± 12.96	P = 0.782

Mean scores on the Continuous performance test commission errors (T-scores) and Wechsler Intelligence Scale for Children, Fourth Edition (standard score) at three-time points: (1) Baseline; (2) Best-dose; and (3) Follow-up. CPT: Continuous performance test; BL: Baseline; BD: Best-dose; FU: Follow-up.