Table 4.

Associations of Wave 1 NMR (Quartiles) and Sex With Transitions in Quit vs. Current E-Cigarette Use Status

Quit vs. current
	OR [95% CI]	p
Wave 1 NMR		.96
Quartile 1	ref.
Quartile 2	1.12 [0.37, 3.45]	.84
Quartile 3	1.05 [0.30, 3.69]	.94
Quartile 4	0.80 [0.21, 3.04]	.74
Sex		.29
Male	ref.
Female	1.51 [0.70, 3.24]
Wave 1 NMR by sex		.01*
Quartile 1 by female	ref.
Quartile 2 by female	0.61 [0.18, 2.11]	.43
Quartile 3 by female	0.66 [0.16, 2.65]	.55
Quartile 4 by female	0.10 [0.02, 0.57]	.01*
Quartile 1 by male	ref.
Quartile 2 by male	2.06 [0.28, 15.21]	.47
Quartile 3 by male	1.68 [0.22, 12.84]	.61
Quartile 4 by male	6.33 [0.92, 43.77]	.06**

Table 4 presents covariate-adjusted odds ratios; CI = confidence interval; NMR = nicotine metabolite ratio; OR = odds ratio; ref. (reference category), ns (nonsignificant).

*Significant at p = .01; **trend-level at p = .06.