Table 2. Effect of adjustment on the OR (95% CI) for the relationship of ever regular e-cigarette use ^a to quitting.

	Wave 1 to 2 quitting	Wave 2 to 3 quitting	Wave 1 to 3 quitting
Unweighted numbers
Total – in baseline	6,503	6,847	6,490
Excluded from final regression	262 (4.0%)	89 (1.3%)	175 (2.7%)
Included in final regression	6,241	6,758	6,315
Total ever e-cigarette users – in baseline	727	1,306	726
Excluded from final regression	24 (3.3%)	12 (0.9%)	16 (2.2%)
Included in final regression	703	1,294	710
Quit	78 (11.1%)	160 (12.4%)	118 (16.6%)
Total never e-cigarette users – in baseline	5,776	5,541	5,764
Excluded from final regression	238 (4.1%)	77 (1.4%)	159 (2.8%)
Included in final regression	5,538	5,464	5,605
Quit	503 (9.1%)	456 (8.3%)	711 (12.7%)
Weighted ORs and 96% CIs
Unadjusted	1.29 (1.01-1.66)	1.52 (1.26-1.83)	1.47 (1.19-1.82)
Adjusted for four most important variables	1.17 (0.90-1.52)	1.54 (1.26-1.88)	1.43 (1.14-.1.78)
Adjusted for all variables included in final list	1.23 (0.94-1.61) [9 variables]	1.51 (1.24-1.85) [6 variables]	1.39 (1.11-1.74) [8 variables]

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