Table 6. Effect of adjustment on the OR (95% CI) for the relationship of ever regular e-cigarette use ^a to quitting.

Type of quitting	Statistic	Wave 1 to 2/3 quitting	Wave 2 to 3/4 quitting	Wave 1 to 2/3/4 quitting
Delayed	Number in baseline in final regression	5,660	5,346	4,956
	Number quitting	448	392	606
	Unadjusted	1.50 (1.13-1.97)	1.28 (1.00-1.64)	1.52 (1.19-1.94)
	Adjusted for four most important variables	1.36 (1.02-1.82)	1.29 (1.00-1.66)	1.41 (1.10-1.82)
	Adjusted for all variables included in final list	1.38 (1.03-1.85)	1.25 (0.97-1.62)	1.43 (1.10-1.85)
Temporary	Number in baseline in final regression	5,413	5,149	4,699
	Number quitting	201	195	349
	Unadjusted	1.10 (0.71-1.70)	1.68 (1.22-2.32)	1.34 (0.97-1.86)
	Adjusted for four most important variables	0.91 (0.58-1.42)	1.74 (1.25-2.43)	1.20 (0.86-1.69)
	Adjusted for all variables included in final list	0.93 (0.59-1.46)	1.60 (1.14-2.25)	1.26 (0.89-1.77)
Sustained	Number in baseline in final regression	5,602	5,298	4,622
	Number quitting	380	344	272
	Unadjusted	1.48 (1.10-1.99)	1.49 (1.16-1.91)	1.29 (0.89-1.86)
	Adjusted for four most important variables	1.41 (1.03-1.93)	1.59 (1.22-2.06)	1.33 (0.91-1.96)
	Adjusted for all variables included in final list	1.51 (1.09-2.08)	1.48 (1.13-1.94)	1.52 (1.02-2.26)

^aWhere the baseline is Wave 1, the predictor is ever regular e-cigarette use, where the baseline is Wave 2, the predictor is ever regular e-product use