Table 3.

Group scores on neurocognitive assessments (Mean ± SD).

	Ketamine users	Poly-drug controls
Trail making A	33.80 ± 10.48*	24.33 ± 6.59
Trail making B	46.20 ± 14.53	40.07 ± 12.41
Trail making total (B–A)	12.40 ± 19.81	15.73 ± 12.07
Verbal fluency	7.50 ± 3.21	8.53 ± 2.70
Category fluency	17.70 ± 4.52	17.33 ± 3.29
Prose recall immediate	6.45 ± 2.42	7.87 ± 3.43
Prose recall delayed	5.80 ± 2.16	7.50 ± 3.15
N-back (1-back)
No. correct responses	38.20 ± 11.30	43.62 ± 10.23
No. false alarms	7.50 ± 6.24	3.15 ± 3.96
d prime score	1.98 ± 1.13*	3.05 ± 1.19
C score	0.10 ± 0.22	0.10 ± 0.22
N-back (2-back)
No. correct responses	27.00 ± 12.74	35.62 ± 13.12
No. false alarms	12.60 ± 6.50	7.77 ± 6.26
d prime score	0.93 ± 1.26*	1.85 ± 1.28
C score	0.23 ± 0.28	0.13 ± 0.31

*p < 0.05; **p < 0.01.