Table 2.

Results from the primary generalized estimating equations (GEE) model regressing attrition status onto nicotine content transition, study period, age, gender, nicotine dependence, race, and highest education level.

	B (SE)	Wald χ2	P	Odds ratio	95% CI (LB,UB)
Intercept	−3.77 (.67)	31.79	< .001	.02	.01, .09
Nicotine content transition
Control (no transition)	REF	REF	REF	REF	REF
High to moderate	−.26 (.47)	.32	.58	.77	(.30, 1.93)
High to low	1.54 (.53)	8.58	.003	4.65	(1.66, 12.99)
Moderate to high	.22 (.78)	.08	.78	1.25	(.27, 5.76)
Moderate to low	.80 (.47)	2.96	.09	2.23	(.89, 5.57)
Low to high	.52 (.65)	.64	.43	1.68	(.47, 5.97)
Low to moderate	.77 (.62)	1.53	.22	2.16	(.64, 7.29)
Preferred brand to high	−.26 (.51)	.27	.61	.77	(.29, 2.08)
Preferred brand to moderate	.25 (.63)	.16	.69	1.29	(.38, 4.40)
Preferred brand to low	1.50 (.47)	10.24	.001	4.48	(1.79, 11.23)
Study period
Second	.92 (.54)	2.92	.09	2.50	(.87, 7.14)
Third	1.15 (.37)	9.70	.002	3.17	(1.53, 6.55)
Fourth	REF	REF	REF	REF	REF
Age	−.03 (.01)	12.91	< .001	.97	(.95, .99)
Gender
Male	REF	REF	REF	REF	REF
Female	−.41 (.29)	1.92	.17	.67	(.38, 1.18)
Nicotine dependence	.07 (.07)	.91	.34	1.07	(.93, 1.23)
Race
White	REF	REF	REF	REF	REF
Non-white	−.70 (.52)	1.85	.17	.50	(.18, 1.36)
Highest education level
HS only	.54 (.39)	1.91	.17	1.71	(.80, 3.65)
Some college	.72 (.33)	4.69	.03	2.06	(1.07, 3.95)
College grad	REF	REF	REF	REF	REF