Table 4.

Predictors of having quit for at least 1 month since last being surveyed, among those with quit attempts

	SEIFA Univariate			Model 2			Model 3
	N	OR	95% CI	N	OR	95% CI	N	OR	95% CI
Total N	1359			1310			1240

Index of Relative Socio-Economic Disadvantage (IRSD)
Lowest disadvantage	198	Ref	(p < .001)	192	Ref	(p < .001)	183	Ref	(p < .01)
Low disadvantage	262	0.5^**	0.4 – 0.8	258	0.6^**	0.4 – 0.8	246	0.6^*	0.4 – 0.9
Moderate disadvantage	271	0.9	0.6 – 1.2	257	0.9	0.6 – 1.4	241	1.0	0.7 – 1.6
High disadvantage	300	0.5^***	0.3 – 0.7	292	0.5^**	0.3 – 0.7	275	0.5^**	0.4 – 0.8
Highest disadvantage	328	0.7^*	0.5 – 0.9	311	0.7	0.5 – 1.1	295	0.8	0.5 – 1.2

Main language spoken at home
English				1163	Ref	(p = .763)	1107	Ref	(p = .836)
Not English				147	0.9	0.7 – 1.4	133	1.0	0.7 – 1.6
Equivalized household income^a
Low				272	Ref	(p = .051)	257	Ref	(p = .253)
Low-moderate				211	1.3	0.9 – 1.8	193	1.2	0.8 – 1.8
Moderate				234	1.4	0.96 – 2.0	223	1.4	0.9 – 2.1
High-moderate				250	1.3	0.9 – 1.9	238	1.1	0.7 – 1.6
High				265	1.9^**	1.3 – 2.7	258	1.5^*	1.02 – 2.3
Not disclosed				78	1.2	0.7 – 2.0	71	1.0	0.6 – 1.9
Education
Low				813	Ref	(p = .286)	763	Ref	(p = .722)
Moderate				295	1.2	0.9 – 1.6	282	1.0	0.8 – 1.4
High				202	1.2	0.8 – 1.7	195	0.9	0.6 – 1.3
Marital Status
Married				465	Ref	(p = .407)	445	Ref	(p = .389)
Separated/ divorced/ widowed				282	0.8	0.6 – 1.2	266	0.9	0.6 – 1.2
DeFacto				205	0.9	0.6 – 1.3	196	0.9	0.6 – 1.3
Single				358	0.8	0.6 – 1.1	333	0.7	0.5 – 1.05
Age group (years)
18 – 24				200	Ref	(p < .05)	191	Ref	(p < .05)
25 – 39				468	0.7^*	0.5 – 0.95	448	0.7	0.4 – 1.003
40 – 54				419	0.6^**	0.4 – 0.8	400	0.5^**	0.3 – 0.8
55 and older				223	0.6^*	0.4 – 0.9	201	0.6^*	0.3 – 0.96
Sex
Female				731	Ref	(p = .555)	688	Ref	(p = .204)
Male				579	1.1	0.8 – 1.4	552	1.2	0.9 – 1.5

Heaviness of Smoking Index
0							228	Ref	(p = .105)
1 to 2							374	0.7	0.5 – 1.02
3 to 4							492	0.6^*	0.4 – 0.9
5 to 6^b							146	0.6^*	0.3 – 0.99
Longest prior quit attempt
None							119	Ref	(p < .001)
Under 1 month							311	0.4^**	0.2 – 0.7
1 month – under 6 months							300	1.1	0.6 – 1.7
6 months or longer							510	1.2	0.7 – 1.9
Quit attempts in the last year?
Yes							741	Ref	(p = .316)
No							499	0.9	0.6 – 1.2
Baseline smoking frequency
Daily							1080	Ref	(p < .01)
Weekly or monthly							160	1.8^**	1.2 – 2.7
Intention to quit
None							127	Ref	(p = .658)
Beyond 6 months							405	1.1	0.7 – 1.7
Within 6 months							420	1.2	0.8 – 2.0
Within 1 month							288	1.0	0.6 – 1.7
Overall opinion of smoking
Positive or neutral							428	Ref	(p = .683)
Negative							515	1.0	0.8 – 1.4
Very negative							297	1.2	0.8 – 1.7
Self-efficacy to quit							1240	1.1^*	1.02 – 1.3
Expected benefits of quitting							1240	0.8^**	0.7 – 0.9
Worries about health effects							1240	1.0	0.9 – 1.2
Favourable attitudes to smoking							1240	1.1	0.9 – 1.2
Time (months) since baseline							1240	1.13^***	1.09 – 1.18
Likelihood ratio:				χ²(2) = 93.7, p < .001			χ²(2) = 234.5, p < .001

Note: Overall significance levels for each categorical variable are provided in brackets next to the reference category.

In the postal-area (POA)-level analyses controlling for clustering, the overall effects of this variable were significant (p < .05) in the Model 2 analysis

In the POA-level analyses controlling for clustering, this category did not reach statistical significance relative to the reference in the Model 3 analysis.

p < .05

^**

p < .01

^***

p < .001.