Interaction between catechol-O-methyltransferase Val/Met polymorphism and cognitive reserve for negative symptoms in schizophrenia

Table 3 The effects of gender, employment and marriage on negative symptoms

	Gender/employment/marriage	n	Mean	SD	t value	u value	P value
PANSS negative	Male	24	13.63	4.79	1.949	52	0.057
	Female	30	11.37	3.73
	Employed	23	11.91	3.85	-0.663	52	0.510
	Non	31	12.71	4.71
	Married	32	12.09	4.71	-0.561	52	0.577
	Non	22	12.77	3.80

PANSS: Positive and negative syndrome scale.