Table 2.

Results Showing Relationship Between Baseline Dependence Measures and Relapse by Stop-Smoking Medication Use

	Predicting relapse risk over different quit periods among daily smokers who made a quit attempt, HR (95% CI)
	1–7	8–14	15–30	31–90	91–180	181–270	271–420	421–730
Dependence measures
HSI: med users	1.12 (1.08–1.18)***	1.11 (1.04–1.19)**	1.04 (0.98–1.11)	1.00 (0.95–1.06)	1.07 (0.99–1.16)	0.88 (0.77–0.99)*	1.03 (0.87–1.22)	0.95 (0.73–1.24)
HSI: med nonusers	1.26 (1.22–1.30)***	1.09 (1.04–1.15)***	1.11 (1.06–1.17)***	1.01 (0.96–1.06)	0.98 (0.92–1.05)	0.93 (0.84–1.03)	1.02 (0.92–1.15)	1.07 (0.91–1.27)
CPD: med users	1.20 (1.11–1.29)***	1.10 (0.97–1.24)	1.11 (0.99–1.24)	0.99 (0.89–1.11)	1.16 (1.01–1.32)*	0.78 (0.61–0.99)*	0.89 (0.63–1.27)	0.82 (0.49–1.37)
CPD: med nonusers	1.37 (1.29–1.45)***	1.16 (1.06–1.28)**	1.15 (1.04–1.28)**	0.96 (0.87–1.06)	0.93 (0.81–1.07)	0.90 (0.73–1.12)	1.05 (0.83–1.32)	1.24 (0.92–1.66)
TTFC: med users	1.17 (1.09–1.26)***	1.22 (1.09–1.38)**	1.01 (0.91–1.12)	1.02 (0.93–1.11)	1.06 (0.94–1.19)	0.87 (0.72–1.06)	1.17 (0.90–1.53)	1.00 (0.66–1.53)
TTFC: med nonusers	1.43 (1.36–1.50)***	1.13 (1.04–1.22)**	1.17 (1.08–1.27)***	1.04 (0.96–1.12)	0.99 (0.89–1.09)	0.89 (0.76–1.03)	1.02 (0.85–1.22)	1.03 (0.77–1.36)

Note. CPD = cigarette per day; HR = hazard ratios were adjusted for age, sex, income, education, country, survey year, and year of recruitment; HSI = Heaviness of Smoking Index; med = medication; TTFC = time to first cigarette upon waking.

*p < .05; **p < .01; ***p < .001.