Table 1.

Associations among the delay discounting indices, income, and nicotine dependence (N = 713).

Variable	M (SD)	1	2	3	4
1 Large k1	.18 (.14)	—	—	—	—
2 Medium k	.22 (.14)	.84**	—	—	—
3 Small k	.26 (.14)	.75**	.82**	—	—
4 FTND	4.01 (2.58)	.22**	.21**	.19**	—
5 Income2	$15,000–$29,999	−.11**	−.09*	−.10*	−.34**

Notes. k = behavioral economic index of impulsivity from the Monetary Choice Questionnaire; medians and (ranges) for k values were: large = .16 (.01–.50), medium = .16 (.01–.50), small = .26 (.01–.50); FTND = Fagerstrom Test for Nicotine Dependence

¹= all k values were square root transformed

²median income; correlations coefficients are pearson coefficients

^*p < .05

^**p < .01