Table 1.

Demographics, PANSS interview, and cognitive test results at baseline and follow-up.

	Patients	Controls	Test statistic
N	49	52
Age range	19–49 years	18–47 years
Age mean + SD	32.4 ± 7.5 years	28.5 ± 7.0 years	t2.66, df99, p = 0.010
M:F (absolute)	42:7	39:13
M:F (pct)	86:14	75:25	χ1.82, p = 0.177
BMI mean + SD	24.9 ± 4.0	23.9 ± 3.7	t1.29, p = 0.201
Smoking	63.8%	5.9%	χ36.77, p < 0.001
THC use prior to study (heavy use defined as more than three times per week)	18.8% light 20.8% heavy	3.9% light	χ19.5, p < 0.001
Duration of illness	6.1 ± 5.9 years
1st episode	26.1%
	Acute psychosis (n = 46)	At follow-up (n = 39)
PANSS total score	83.4 ± 14.6	59.1 ± 12.1	t10.9, df37, p < 0.001
PANSS positive scale score	24.8 ± 5.0	10.8 ± 2.9	t17.9, df37, p < 0.001
PANSS negative scale score	18.4 ± 7.4	17.2 ± 7.0	t1.3, df37, p = 0.197
PANSS general psychopathology scale score	40.6 ± 7.9	30.9 ± 7.1	t6.9, df37, p < 0.001
SDST score (numbers correct)	44.0 ± 12.0	48.0 ± 11.7	t2.84, df37, p = 0.008
LNS adjusted score	5.0 ± 2.2	5.2 ± 2.4	t0.77, df37, p = 0.446

Data are expressed as mean values ± SD.