Table 4.

Propensity score matched analysis for biochemically-verified tobacco abstinence at 6-month follow-up by e-cigarette use, stratified by study arm.

			Biochemically confirmed tobacco abstinence (past 7 days)
	Standard Care (Control)					Sustained Care (Intervention)					Interaction*
E cigarette use	Nᶧ	Yes %	No %	Risk Difference	95% CI	Nᶧ	Yes %	No %	Risk Difference	95% CI	P
Prior to hospital admission
Use in the past 30 days	117	17.9	14.5	3.4	−6.0, 12.9	106	21.7	22.6	−0.9	−12.1, 10.2	0.57
3 month follow-up
Any use since discharge	113	12.0	24.1	−12.0	−21.2, 2.9	104	7.7	29.8	−22.1	−32.3, −11.9	0.14
Use in the past 30 days	93	14.0	18.3	−4.3	−14.9, 6.3	69	8.7	18.8	−10.1	−21.5, 1.2	0.39
Use in the past 7 days	66	16.7	19.7	−3.0	−16.2, 10.1	51	9.8	15.7	−5.9	−18.8, 7.0	0.66
At both 1 and 3 months
Use in the past 30 days	53	15.1	26.4	−11.3	−26.6, 4.0	38	13.2	21.1	−7.9	−24.7, 8.9	0.86
Use in the past 7 days	33	17.1	17.1	0.0	−17.7, 17.7	22	18.2	27.3	−9.1	−33.7, 15.5	0.59

^*Interaction between study arm and e-cigarette use measure

^ᶧNumber of matched pairs