. 2016 Jul 13;11(7):e0159245. doi: 10.1371/journal.pone.0159245

Table 3. Predictors of subsequent quit attempts.

Independent Variables	%	Bivariate	Adjusted 1	Adjusted 2	Adjusted 3	Adjusted 4
Independent Variables		OR	AOR	AOR	AOR	AOR
Country
United States	42%	REF	REF	REF	REF	REF
Australia	40%	0.92	1.07	1.08	1.03	1.14
Canada	42%	0.97	0.99	0.96	0.96	1.10
Mexico	59%	1.83^c	1.16	1.18	1.21^a	1.31^b
Age
18–24	57%	REF	REF	REF	REF	REF
25–34	56%	0.96	0.95	0.94	0.95	0.96
35–44	48%	0.68^c	0.84	0.78	0.80	0.87
45–54	38%	0.47^c	0.74^a	0.69^b	0.70^b	0.79
55–64	34%	0.38^c	0.63^b	0.59^c	0.57^c	0.69^b
Gender
Male	46%	REF	REF	REF	REF	REF
Female	45%	0.87^a	1.00	0.98	0.96	1.01
Education
High school or less	39%	REF	REF	REF	REF	REF
Some college or university	40%	1.06	1.06	1.07	1.05	1.06
University or more	54%	1.72^c	1.27^b	1.27^b	1.26^b	1.17
Income
Low	44%	REF	REF	REF	REF	REF
Medium	45%	1.11	0.98	0.99	0.98	1.01
High	47%	1.17^a	0.94	0.96	0.95	0.97
Heaviness of Smoking Intensity	1.68^{^}	0.80^c	0.95^a	0.96	0.95	0.96
Recent Quit attempt
No	21%	REF	REF	REF	REF	REF
Yes	76%	13.39^c	6.89^c	6.62^c	6.83^c	6.60^c
Quit Intentions
No	26%	REF	REF	REF	REF	REF
Yes	67%	3.53^c	2.21^c	2.10^c	2.15^c	2.16^c
Self-efficacy	5.59^{^}	1.15^c	1.04^b	1.04^b	1.06^c	1.03^a
State reactance	3.59^{^}	1.04^b	1.03^a	1.03^a	1.01	1.01
Attention to HWLs
Never	33%	REF	REF	N/A^**	N/A^***	N/A^****
Rarely	39%	1.17^b	1.24^b
Sometimes	53%	1.69^c	1.55^c
Often	64%	2.26^c	1.98^c
Very Often	69%	2.58^c	2.39^c
Thinking about health risks due to HWLs
Low	27%	REF	N/A^*	REF	N/A^***	N/A^****
Moderate	42%	1.64^c		1.30^e
High	63%	3.07^c		1.83^f
Avoiding HWLs
No	36%	REF	N/A^*	N/A^**	REF	N/A^****
Yes	59%	1.90^c			1.63^c
Forgoing cigarettes due to HWLs
Never	32%	REF	N/A^*	N/A^**	N/A^***	REF
Once or more	70%	3.26^c				2.37^c

^a = p<0.05;

^b = p<0.01;

^c = p<0.001

^ = mean

*Model adjusts for all variables listed in the table, survey wave, and time in sample, but not avoiding HWLs, thinking about health risks due to HWLs, and forgoing cigarette due to HWLs

**Model adjusts for all variables listed in the table, survey wave, and time in sample, but not attention to HWLs, thinking about health risks due to HWLs, and forgoing cigarette due to HWLs

***Model adjusts for all variables listed in the table, survey wave, and time in sample, but not attention to HWLs, avoiding HWLs, and forgoing cigarette due to HWLs

****Model adjusts for all variables listed in the table, survey wave, and time in sample, but not attention to HWLs, thinking about health risks due to HWLs, and avoiding HWLs