Table 3.

Associations among phase 2 log-transformed delay discounting measures with the percentage of surveys endorsing alcohol, cannabis, or tobacco use or craving (N=97).^a

Measures and variable		Adjusted mean difference (95% CI)b	P value
Phase 2 baseline MCQc
	Percentage of alcohol use	1.00 (–0.75 to 2.75)	.26
	Percentage of cannabis use	0.20 (–2.80 to 3.20)	.89
	Percentage of tobacco use	4.32 (0.29 to 8.34)	.04
	Percentage of alcohol craving	2.73 (–0.84 to 6.31)	.13
	Percentage of cannabis craving	1.02 (–3.16 to 5.20)	.63
	Percentage of tobacco craving	3.46 (–0.63 to 7.55)	.10
Phase 2 baseline time-selection delay discounting
	Percentage of alcohol use	0.64 (–1.10 to 2.38)	.47
	Percentage of cannabis use	–1.07 (–4.04 to 1.89)	.47
	Percentage of tobacco use	5.89 (1.99 to 9.79)	.003
	Percentage of alcohol craving	2.65 (–0.89 to 6.20)	.14
	Percentage of cannabis craving	–0.36 (–4.51 to 3.78)	.86
	Percentage of tobacco craving	3.92 (–0.12 to 7.95)	.06
Phase 2 baseline monetary-selection delay discounting
	Percentage of alcohol use	0.97 (–0.27 to 2.22)	.13
	Percentage of cannabis use	–1.17 (–3.30 to 0.97)	.28
	Percentage of tobacco use	–0.62 (–3.57 to 2.32)	.68
	Percentage of alcohol craving	1.78 (–0.79 to 4.34)	.17
	Percentage of cannabis craving	–1.29 (–4.27 to 1.69)	.39
	Percentage of tobacco craving	–1.07 (–4.03 to 1.90)	.48

^aData are from a mobile-based ecological momentary assessment study assessing the validity of a novel delay discounting tool between 2020 and 2021. Participants were US adults recruited from social media. An example of a time-selection item is “How long would you be willing to wait to get US $100 instead of US $50 today?” An example of a monetary-selection item is “How much money would you take today instead of US $100 in a year?”

^bLinear regression models adjusted for number of completed surveys and participant sex and age. Delay discounting rates are log-transformed.

^cMCQ: Monetary Choice Questionnaire.