Table 3.

Likelihood of having a quit attempt using Nicotine Replacement Therapy (NRT) by demographic and smoking characteristics (n = 3843): logistic regression with predictive margins (%) and average marginal effects (AME).

	Logistic Regression			Predictive margins		AME^
	aOR	95%CI	p-value	%	95%CI	p-value
Year	1·13	1·06,1·20	0·0001
Year by Year	0·99	0·99,1·00	0·0002
Age group
15–29 years	Ref			25·8	22·8,28·8
30–44 years	1·77	1·44,2·18	<0·0001	37·4	34·6,40·2	<0·0001
45–59 years	1·61	1·28,2·03	<0·0001	35·4	31·9,38·8	<0·0001
60+ years	1·62	1·23,2·12	0·001	35·4	30·8–40·0	0·001
Gender
Female	Ref			34·3	32·1,36·5
Male	0·90	0·77,1·05	0·194	32·1	29·7,34·6	0·193
Socioeconomic disadvantage
Most	0·53	0·39,0·72	<0·0001	See Fig. 4d
Least	Ref
Most by Year	1·04	1·01,1·07	0·004
Region
Metropolitan	Ref			34·5	32·5,36·5
Country	0·83	0·69,0·99	0·042	30·5	27·4,33·7	0·039
Heaviness of smoking
10 or fewer cigarettes per day	Ref			See Fig. 4e
More than 10 per day	2·67	1·94,3·68	<0·0001
Quantity not provided	0·95	0·44,2·08	0·901
More than 10 per day by Year	0·97	0·94,1·00	0·027
Quantity not provided by Year	0·94	0·87,1·01	0·099
Quit intentions in next 6 months
Intend to quit	Ref			See Fig. 4f
Do not intend to quit	0·76	0·52,1·13	0·176
Can't say	0·65	0·39,1·10	0·109
Do not intend to quit by Year	0·95	0·91,0·99	0·013
Can't say by Year	1·01	0·96,1·06	0·680
Mental health condition	2005 to 2017 (n = 2041)
No	Ref			35·4	32·8,38·1
Yes	0·92	0·71,1·20	0·536	33·7	28·7,38·7	0·533

^{^}Comparing percentage point difference in predictive margins compared to reference group for average values when no interaction is present (AME). Representative values for the years of 1998, 2007 and 2017 are available in the Supplementary data file. Notes: aOR=adjusted Odds Ratio, 95%CI=95% Confidence Interval Lower and Upper.