Table 1

 Tests of cognitive function: group scores (standard deviation in brackets)

TaskHydro/SBHydroSBControls
*The lower the test scores the better.
Eyes Test of Emotional Judgement, n471850
    Mean age26.8 (6.1)30.4 (9.6)30.1 (7.9)
    Mean NART IQ107.9 (8.6)107.7 (9.8)113.4 (4.1)
    Mean eyes test score (max 25)19.8 (2.9)19.8 (2.8)19.8 (2.1)
Visual and Spatial Recognition Memory, n46271967
    Mean age26.8 (6.7)30.5 (8.6)27.6 (8.2)29.9 (10.4)
    Mean NART IQ109.2 (10.1)110.0 (9.2)111.1 (7.3)108.7 (6.8)
    Mean visual recognition score (max 24)19.7 (2.7)19.2 (3.4)21.2 (2.3)21.3 (2.4)
    Mean spatial recognition score (max 20)13.7 (2.8)13.2 (3.3)15.7 (2.7)16.4 (2.0)
Spatial Memory Span, n39261967
    Mean age27.3 (7.1)30.1 (8.5)26.4 (6.9)30.2 (10.0)
    Mean NART IQ109.4 (9.7)109.4 (9.4)110.9 (8.5)110.5 (7.4)
    Mean spatial span score (max 9)4.9 (1.0)5.3 (1.1)5.9 (1.2)6.5 (1.5)
Spatial Working Memory*, n30191567
    Mean age27.2 (7.5)28.8 (7.4)26.9 (7.0)29.1 (8.6)
    Mean NART IQ109.3 (9.9)109.5 (9.3)111.9 (8.3)111.2 (8.8)
    Mean spatial working memory errors39.9 (22.5)40.7 (24.5)21.0 (11.9)16.1 (15.9)
    Mean spatial working memory strategy33.4 (6.4)34.2 (6.9)29.7 (6.6)30.7 (6.0)
IDED Attentional Set-Shifting/Cognitive Flexibility Task, n37181672
    Mean age26.5 (7.1)29.6 (8.0)27.6 (6.4)29.2 (8.6)
    Mean NART IQ108.8 (9.7)109.7 (10.1)112.5 (6.9)111.6 (8.6)
    Mean total error score38.2 (21.6)35.8 (21.5)15.9 (11.6)17.0 (11.8)
Verbal (FAS) and Semantic (animals) Fluency, n52332667
    Mean age28.3 (8.2)28.7 (8.5)29.3 (8.3)29.6 (9.0)
    Mean NART IQ107.8 (9.8)107.1 (10.0)111.5 (6.7)110.9 (8.3)
    Mean FAS words produced29.0 (10.0)29.8 (10.7)41.2 (11.1)42.7 (11.4)
    Mean animals produced20.9 (5.6)20.0 (4.7)25.8 (4.9)30.5 (8.6)
Hopkins Verbal Memory and Learning, n5121Control database
    Mean age30.6 (8.9)33.3 (12.1)
    Mean NART IQ103.9 (8.0)106.7 (8.4)
    Mean immediate recall score (max 12)5.7 (1.4)7.2 (1.3)Average score 6–8
    Mean 3-trial total learning score (max 36)21.7 (3.9)26.5 (4.7)Average score 25–32
    Mean recognition memory score (max 24)23.1 (1.0)23.6 (0.7)Average score 23–24
    Mean delayed recall score (max 12)6.6 (3.7)9.7 (1.8)Average score 9–11
    Mean intrusion errors2.5 (2.5)1.0 (1.3)
    Mean strategy score (max 12)4.9 (2.6)8.4 (2.1)
Trails Test of Psychomotor Speed and Attention, n2113Control database
    Mean age30.6 (7.2)28.7 (8.6)
    Mean NART IQ105.7 (9.4)108.4 (6.9)
    Mean Trails A total (seconds)44.5 (25.5)28.6 (7.3)Average time 22–40
    Mean Trails B total (seconds)91.7 (31.7)62.6 (12.7)Average time 50–75