Table 1 Research participant groups ages, education, and behavioural performance

	Control (n = 29) 15 females/14 males		Schizophrenia (n = 28) 11 females/17 males		Bipolar I disorder (n = 28) 12 females/16 males		Methamphetamine-induced psychosis (n = 24) 10 females/14 males
	Median	Range	Median	Range	Median	Range	Median	Range
Age on day of imaging (years)	26	19–34^a	29	20–39^a	30.5	21–40	24.5	19–35	H_3,109 = 12.76, p = 0.005	SCZ vs. CON&MPDp = 0.01; BPD vs. CON&MPDp = 0.01
Duration at school (years)	12	8–14	12	7–14	12	9–12^b	10	7–12	H_3,109 = 15.21, p = 0.001	MPD vs. CONp = 0.001; MPD vs. BPDp = 0.005
Tertiary education (years)	1	0–10	0	0–6	1.5	0–8^b	0	0–4.5	H_3,109 = 8.21, p = 0.04	MPD vs. CONp = 0.03; MPD vs. BPDp = 0.006
Total duration of education (years)	12	8–22	12	7–18	13.5	9–20^b	10	7–16.5	H_3,109 = 14.33, p = 0.02	MPD vs. CONp = 0.0009; MPD vs. BPDp = 0.0007
Handedness (left:right)	1:28		3:25		2:26		2:22
Continuous performance task
Correct responses (×/60)^c	59	37–60	49	15–60^d	58	45–60	50	16–60	H_3,105 = 20.19, p = 0.002	CON vs. SCZp < 0.001; CON vs. MPDp < 0.001; BPD vs. SCZp = 0.01
Overall response time (ms)^c	209	103–532	438	57–1044^d	302	203–371	275	105–676	H_3,105 = 14.48, p = 0.002	CON vs. SCZp < 0.001; CON vs. MPDp < 0.001; BPD vs. SCZp = 0.03
Errors of commission^c	0	0–20	5	0–33	1	0–13	4	0–44	H_3,105 = 9.70, p = 0.02	CON vs. SCZp = 0.02; CON vs. MPDp = 0.003
Errors of omission	0	0–9^e	3	0–45	0	0–18	0	0–21	H_3,105 = 18.14, p < 0.001	SCZ vs. CONp < 0.001; SCZ vs. BPDp = 0.002; SCZ vs. MPDp = 0.03

^a SCZ and BPD older than CON and MPD
^b MPD lower education than CON and BPD
^c CON better behavioural performance than SCZ and MPD
^d BPD better performance than SCZ
^e SCZ greater number of omissions than all other groups, p < 0.05
SCZ schizophrenia, BPD bipolar disorder, CON controls, MPD methamphetamine-induced psychotic disorder

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