Table 2.

Substance use reported during online TLFB compared with In‐Person TLFB

	Online TLFB		In‐person TLFB		p‐value	Correlation
	Mean	SD	Mean	SD
Days of cannabis use	7.78	4.71	7.92	4.62	.635	.902**
Days of flower cannabis use	6.46	4.72	6.54	4.72	.813	.873**
Cannabis flower consumed (g)	5.34	6.78	5.79	8.59	.548	.804**
Days of concentrate cannabis use	1.50	3.16	1.68	3.21	.237	.944**
Days of edible cannabis use	0.44	1.07	0.36	0.94	.399	.789**
Days of alcohol use	4.02	2.72	4.24	2.54	.115	.886**
Total drinks	23.38	18.02	28.14	25.74	.023*	.852**
Drinks per drinking day	5.47	2.66	5.94	3.23	.115	.780**
Days of nicotine/tobacco use	3.46	5.12	4.36	5.23	.022*	.864**
Total units of nicotine/tobacco	43.80	72.18	41.98	66.15	.835	.833**
Nicotine/tobacco units per day	3.93	5.22	3.58	4.73	.621	.780**
Days of prescription drug use	0.80	2.81	0.72	2.16	.794	.653**
Days of illegal drug use	0.34	0.77	0.28	0.70	.322	.838**

Pearson correlations reported for all correlations using a 95% confidence interval. p‐value calculated from paired sample t test between online TLFB and In‐person TLFB substance use reports.

Abbreviation: TLFB, Timeline Followback.

^* p < .05.

^** p < .001.