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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Exp Clin Psychopharmacol. 2016 Feb;24(1):30–37. doi: 10.1037/pha0000059

Table 2.

Bivariate relationship between study variables and delay discounting rate, including R2 and significance.

Variable N R2 F value df Numerator df Denominator p-value
Protocol 599 0.121 6.76 12 586 <.0001
Discounting version 599 0.041 6.35 4 594 <.0001
Age 599 0.008 4.99 1 597 0.026
Education 595 0.061 38.86 1 593 <.0001
Employment status 593 0.057 11.88 3 589 <.0001
Gender 599 0.017 10.65 1 597 0.0012
Income 594 0.021 13.00 1 592 0.0003
Marital status 582 0.011 1.64 4 577 0.1629
Race 598 0.008 2.49 2 595 0.0841
Treatment seeking 599 0.007 4.51 1 597 0.0341
Alcohol dependence 599 0.005 3.02 1 597 0.0827
Cocaine dependence 599 0.048 30.02 1 597 <.0001
Heavy smoking 599 0.039 24.33 1 597 <.0001