Table 1.

Demographics of control and patient groups (SD in parentheses).

	Controls	Patients	Statistics
	N=102	N=104
Age	31.8(11.5)	39.7(10.2)	t=4.005, p<0.001**
Male gender (%)	45(44.1%)	52(50%)	χ2 (1)=0.715, p=0.398
Education (years)	15.4(3.2)	13.4(2.8)	t=4.858, p<0.001**
Smoking (PPD)	0.029(0.147)	0.154(0.39)	t=3.033, p=0.003*
Retained pairs	116.1(20.6)	107.7(22.7)	t=2.79, p=0.006*
Patients
Age of onset		23.8(8.1)
Duration of illness		14.1(9.9)
CPZ equivalence		332.5(229.8)
PANSS(P1 to P7)		11.8(4.2)
PANSS(N1 to N7)		15.3(6.0)
PANSS(G1 to G16)		25.4(8.2)

*p < 0.05; **p < 0.001.