Table 2.

PON/HDLC ratios

	Schizophrenia subjects treated with clozapine	Schizophrenia subjects treated with risperidone	Control subjects	p values—clozapine vs. control	p values—risperidone vs. control	p values—clozapine vs. risperidone
PON(PO)/HDLC ratio (U/mg)	202.20 (1.86) (N = 42)	213.30 (2.48) (N = 20)	222.45 (1.72) (N = 14)	<0.001	n.s.	<0.01
PON(PO-NaCl)/HDLC ratio (U/mg)	308.77 (2.87) (N = 42)	298.65 (14.99) (N = 21)	315.22 (1.18) (N = 14)	n.s.	n.s.	n.s.
PON(PA)/HDLC ratio (U/mg)	274.39 (5.36) (N = 36)	288.28 (4.61) (N = 17)	288.48 (3.91) (N = 11)	n.s.	n.s.	n.s.
PON(DHC)/HDLC ratio (U/mg)	98.55 (3.80) (N = 36)	127.76 (6.13) (N = 16)	160.60 (7.32) (N = 12)	<0.001	<0.01	<0.001

All the values are expressed as mean (SEM)