Table 1.

Measures of neurocognition

Cognitive domains	Group tests	Outcome measure
Sustained attention and vigilance	Continuous performance test (CPT‐HQ) (CPT performance and CPT variance)	An efficiency score [(accuracy/reaction time) ×1000] was created, in which accuracy was measured as the total number of hits (range 0–28) minus the total number of errors (range 0–28), divided by 28. If this calculation of accuracy was non‐positive (i.e., the number of errors equaled or exceeded the number of hits), then the accuracy was set equal to 0.005. This score was referred to as ‘CPT performance’. Intra‐individual variability in reaction time on the CPT was also evaluated (CPT variance), using the standard deviation score of the subject's mean response time on the hit trials 23, 51.
Verbal learning and memory	Word Learning Task (WLT) (Immediate and delayed recall)	Immediate recall (total score of three consecutive trials of 15 words learning) and ‘Delayed recall’ was assessed after 20 min delay
Global cognitive functioning
Processing speed	Digit symbol substitution	Total raw score (0–133)
Verbal comprehension	Information	Total raw score (0–28)
Working memory	Arithmetic	Total raw score (0–22)
Problem‐solving and Visuospatial abilities	Block design	Total raw score (0–68)