title: Comparison between two measures of delay discounting in smokers.
abstract: Agreement between computer and questionnaire measures of delay discounting in smokers was compared. Correlations between measures for small, medium, or large rewards were significant. Log k values decreased as the reward delay increased, with values lower for the computer task than the questionnaire, with significant differences for small rewards. The 2 measures were related to smoking rate but not to age, gender, or obesity. The Bland-Altman test of agreement indicated large within-subject differences in k values between the 2 measures. The size of the difference between the log k values and magnitude of the log k values were positively related. Results suggest k values from the 2 measures are related but may not be used interchangeably.
authors.affiliation: Department of Pediatrics, University at Buffalo School of Medicine and Biomedical Sciences, New York 14214-3000, USA. lhenet@acsu.buffalo.edu
authors.forename: Leonard H
authors.initials: LH
authors.lastname: Epstein
authors.forename: Jerry B
authors.initials: JB
authors.lastname: Richards
authors.forename: Frances G
authors.initials: FG
authors.lastname: Saad
authors.forename: Rocco A
authors.initials: RA
authors.lastname: Paluch
authors.forename: James N
authors.initials: JN
authors.lastname: Roemmich
authors.forename: Caryn
authors.initials: C
authors.lastname: Lerman
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012055:Reinforcement Schedule; D012201:Reward; D012907:Smoking / Q000523:psychology*; D011795:Surveys and Questionnaires; D013997:Time Factors