Table 3.

Predictors of making a quit attempt since last being surveyed.

	SEIFA Univariate			Model 2			Model 3
	N	OR	95% CI	N	OR	95% CI	N	OR	95% CI
Total N	3503			3419			3237

Index of Relative Socio-Economic Disadvantage (IRSD)
Lowest disadvantage	511	Ref	(p = .937)	501	Ref	(p = .775)	478	Ref	(p = .665)
Low disadvantage	651	1.1	0.8 – 1.3	642	1.1	0.9 – 1.4	608	1.2	0.9 – 1.6
Moderate disadvantage	696	1.0	0.8 – 1.3	675	1.1	0.8 – 1.4	639	1.1	0.9 – 1.5
High disadvantage	770	1.0	0.8 – 1.2	753	1.1	0.6 – 1.4	718	1.2	0.9 – 1.5
Highest disadvantage	875	0.9	0.7 – 1.1	848	1.0	0.8 – 1.3	794	1.2	0.9 – 1.6

Main language spoken at home
English				3012	Ref	(p = .241)	2871	Ref	(p = .470)
Not English				407	0.9	0.7 – 1.1	366	0.9	0.7 – 1.2
Equivalized household income
Low				704	Ref	(p = .289)	663	Ref	(p = .421)
Low-moderate				585	0.9	0.7 – 1.1	551	0.9	0.7 – 1.1
Moderate				648	0.9	0.7 – 1.1	616	0.9	0.7 – 1.2
High-moderate				644	1.0	0.8 – 1.3	611	1.0	0.8 – 1.3
High				623	1.1	0.9 – 1.4	603	1.1	0.8 – 1.4
Not disclosed				213	0.9	0.7 – 1.3	193	1.2	0.9 – 1.8
Education
Low				2206	Ref	(p < .05)	2075	Ref	(p = .755)
Moderate				741	1.1	0.9 – 1.3	712	1.1	0.9 – 1.3
High				472	1.3^*	1.1 – 1.6	450	1.1	0.9 – 1.4
Marital Status
Married				1331	Ref	(p = .145)	1267	Ref	(p = .294)
Separated/ divorced/ widowed				740	1.2	0.97 – 1.4	700	1.2	0.96 – 1.5
DeFacto				465	1.2	0.98 – 1.5	444	1.2	0.9 – 1.6
Single				883	1.0	0.8 – 1.3	826	1.1	0.9 – 1.4
Age group (years)
18 – 24				416	Ref	(p < .001)	399	Ref	(p < .05)
25 – 39				1149	0.7^**	0.6 – 0.9	1099	0.8	0.6 – 1.07
40 – 54				1256	0.5^***	0.4 – 0.7	1191	0.7^*	0.5 – 0.9
55 and older				598	0.6^**	0.5 – 0.8	548	0.9	0.7 – 1.3
Sex
Female				1870	Ref	(p = .320)	1770	Ref	(p = .949)
Male				1549	0.9	0.8 – 1.1	146	1.0	0.8 – 1.2

Heaviness of Smoking Index
0							482	Ref	(p = .079)
1 to 2							861	1.0	0.8 – 1.3
3 to 4							1418	0.8	0.6 – 1.1
5 to 6							476	0.8	0.5 – 1.1
Longest prior quit attempt
None							529	Ref	(p = .110)
Under 1 month							833	1.1	0.8 – 1.5
1 month – under 6 months							698	1.3	0.9 – 1.7
6 months or longer							1177	1.3^*	1.02 – 1.8
Quit attempts in the last year?
Yes							1394	Ref	(p < .001)
No							1843	0.5^***	0.4 – 0.6
Baseline smoking frequency
Daily							2947	Ref	(p < .001)
Weekly or monthly							290	1.7^**	1.3 – 2.4
Intention to quit
None							799	Ref	(p < .001)
Beyond 6 months							1258	1.7^***	1.3 – 2.1
Within 6 months							784	3.2^***	2.4 – 4.1
Within 1 month							416	5.7^***	4.2 – 7.9
Overall opinion of smoking
Positive or neutral							1411	Ref	(p = .401)
Negative							1207	1.1	0.9 – 1.4
Very negative							619	1.1	0.9 – 1.4
Self-efficacy to quit							3237	1.1	0.99 – 1.1
Expected benefits of quitting							3237	1.0	0.9 – 1.1
Worries about health effects							3237	1.3^***	1.1 – 1.4
Favourable attitudes to smoking							3237	1.0	0.9 – 1.1
Time (months) since baseline							3237	1.1^***	1.07 – 1.13
Likelihood ratio:				χ²(2) = 184.0, p < .001			χ²(2) = 861.0, p < .001

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

p < .05

^**

p < .01

^***

p < .001.