Table 2 Results of logistic regression analyses to test associations between NRT use or use of other aids and continuous abstinence for 6 months

	Odds ratio (95% CI) adjusting for FTND
	Phase 1 sample	Phase 2 sample	Combined sample
Model 1
NRT vs no NRT	3.0* (1.2 to 7.5)	2.1* (1.0 to 4.1)	2.2* (1.3 to 3.9)
Model 2
Other aid vs no other aid†	0.8 (0.2 to 3.1)	1.6 (0.7 to 3.7)	1.4 (0.7 to 2.7)

NRT, nicotine replacement therapy; FTMD, Fagerstrom test of nicotine dependence.
*p<0.05 difference between groups (two-tailed).
†Other aids include hypnotherapy, acupuncture, herbal remedies, the internet or books.