Table 4.

Adjusted Models Between Quit Success and Spontaneous Quit attempts and Potential Confounder

	Adjusted
	OR (95% CI)	p	BF(HN)
Model 1
Spontaneous quit attempt (not spontaneousa)	1.18 (0.96 to 1.46)	.113	0.94c
Quit attempt made without cutting down first (with cutting down firsta)	3.15 (2.54 to 3.91)	<.001	>10 000d
Model 2
Spontaneous quit attempt (not spontaneousa)	1.28 (1.04 to 1.57)	.017	3.86d
Strength of urges
Nonea (n = 154)
Slight (n = 272)	1.32 (0.87 to 2.02)	.199	1.18c
Moderate (n = 944)	0.75 (0.52 to 1.09)	.127	1.46c
Strong (n = 468)	0.55 (0.37 to 0.84)	.005	24.33d
Very strong (n = 135)	0.62 (0.36 to 1.05)	.079	2.73c
Extremely strong (n = 45)	0.66 (0.29 to 1.41)	.302	1.24c
Model 3
Spontaneous quit attempt (not spontaneousa)	1.25 (1.02 to 1.54)	.029	2.16c
Daily cigarette consumption	0.80 (0.71 to 0.89)	<.001	136.82d
Model 4
Spontaneous quit attempt (not spontaneousa)	1.36 (1.11 to 1.67)	.003	31.70d
Social grade
ABa (n = 260)
C1 (n = 465)	1.10 (0.79 to 1.54)	.561	0.40c
C2 (n = 438)	0.81 (0.57 to 1.14)	.216	0.83c
D (n = 349)	0.71 (0.49 to 1.02)	.064	2.25c
E (n = 506)	0.48 (0.33 to 0.68)	<.001	1114.57d

BF = Bayes factor; CI = confidence interval; OR = odds ratio.

^aReference level.

^bEvidence for the null hypothesis.

^cData are insensitive to detect an effect.

^dEvidence for the alternative hypothesis.