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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Schizophr Res. 2014 May 27;157(0):48–54. doi: 10.1016/j.schres.2014.04.035

TABLE 2.

Neuropsychological Tests: Means, Standard Deviations, and Main Effects of Schizophrenia and Cannabis

CUD (−)
(n=87)
Mean (SD)		 CUD (+)
(n=47)
Mean (SD)		 Main Effect:
EOS		 Main Effect:
CUD		 EOS-by-CUD
Interaction
ANT subtest
Alerting (ms) F1,128=2.6, p=.11 F1,128=5.3, p=.02 F1,128=.25, p=.62
EOS (−) (n=82) 53.5 (31.6) 38.6 (52.1)
EOS (+) (n=52) 74.3 (39.8) 46.5 (29.5)
Orienting (ms) F1,128=5.7, p=.02 F1,128=3.8, p=.05 F1,128=.44, p=.51
EOS (−) (n=82) 52.5 (22.2) 42.1 (44.6)
EOS (+) (n=52) 73.1 (48.8) 52.5 (25.4)
Conflict (ms) F1,128=1.8, p=.18 F1,128=10.5, p=.002 F1,128=8.3, p=.005
EOS (−) (n=82) 96.4 (34.6) 120.2 (66.8)
EOS (+) (n=52) 104.5 (75.7) 144.5 (114.4)

Note: Multivariate tests (Wilk’s lambda): Age: F=3.8, p=.01; Mean Reaction Time: F=35.7, p<.001. EOS=early-onset schizophrenia; CUD=cannabis use disorder.