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. 2017 Jul 14;44(3):535–541. doi: 10.1093/schbul/sbx092

Table 1.

Demographic and Clinical Data

	Normal Controls		Schizophrenia Patients
	Nonsmokers (n = 20)	Smokers (n = 20)	Nonsmokers (n = 30)	Smokers (n = 30)	P or χ² Value
	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)	P or χ² Value
Age	34.60 (8.90)	35.50 (6.30)	36.83 (9.24)	39.23 (8.64)	.240^a
Gender (male/female)	12/8	17/3	17/13	21/9	.144^b
Handedness	19/1	20/0	29/1	28/2	.688^b
Predicted premorbid IQ	107.50 (6.77)	106.90 (11.22)	104.01 (9.35)	102.10 (9.35)	.139^c
Pack years		9.25 (6.84)		23.30 (19.54)	.012^d
CPZ			437.10 (293.58)	624.70 (535.99)	.382^d
Duration of illness			11.15 (8.68)	14.23 (7.81)	.100^d
PANSS Positive			14.27 (4.47)	13.30 (4.60)	.412^e
PANSS Negative			17.20 (5.68)	14.53 (5.22)	.063^e
PANSS General			31.47 (9.22)	28.93 (9.13)	.321^d

Note: IQ, Intelligence Quotient; CPZ, chlorpromazine equivalent dose; PANSS, Positive and Negative Syndrome Scale.

^a1-way ANOVA.

^bChi-square test.

^cKruskal Wallis test.

^dMann-Whitney test.

^eStudent t test.