Table 2.

Proportion of Participants Reporting Brief Interventions at Follow-Up by Study Group

	Mail		In-person		In-person vs. Mail	Web		Web vs. Mail
	%*	Number (%*)	%*	Number	p value**	%*	Number	p value**
No prior experience with BIs at baseline N = 898	43.1	110/255	44.3	139/314		43.5	143/329
3 month follow-up
BIs in the past 90 days N = 730	83.4	186	86.4	216	0.364	80.9	208	0.481
BIs in the past 30 days N = 692	77.9	162	76.4	181	0.705	70.5	174	0.073
6 month follow-up
BIs in the past 90 days N = 697	80.4	172	78.6	184	0.649	74.7	186	0.147
BIs in the past 30 days N = 651	78.7	155	75.6	167	0.450	76.0	177	0.504

^*Proportion of participants reporting BIs at follow-up.

^**P-values adjusted for prior BI experience as reported at baseline.