Table 1.

Demographic and clinical subject data

	Mean ± SD				P-value
	MALC	FALC	MNC	FNC	ALC versus NC	M versus F
QFI	13.3 ± 10.9	6.1 ± 5.3	0.1 ± 0.3	0.4 ± 0.5	<0.0001	0.347
Length of sobriety (years)	3.8 ± 6.8	7.3 ± 8.8	_	_	_	0.211
Age at scan	52.3 ± 7.0	51.8 ± 11.3	52.5 ± 16.2	57.8 ± 10.3	0.224	0.540
Years of education	13.8 ± 2.7	15.3 ± 2.8	16.5 ± 2.3	14.4 ± 1.9	0.281	0.128
Full scale IQ	101.9 ± 13.9	109.8 ± 17.3	116.1 ± 16.4	108.6 ± 10.2	0.144	0.327

Notes: QFI, an estimate of amount of alcohol consumed, is derived from the amount, type, and frequency of alcoholic usage over the last 6 months for the nonalcoholic subjects and over the last 6 months before sobriety for the alcoholic subjects. The Full Scale IQ was determined by the Wechsler Adult Intelligence Scale, 3rd edition.³⁶

The P-values were determined by a student t-test. The QFI between the male alcoholics and female alcoholics (not shown) was significant (P = 0.034).

Abbreviations: MALC, male alcoholic; FALC, female alcoholic; MNC, male normal control; FNC, female normal control; QFI, quantity frequency index.