Table 1.
Likelihood of having a recent (past 12 months) quit attempt by demographic and smoking characteristics (n = 11,830): 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 | 0·98 | 0·94,1·01 | 0·199 | |||
| Year by Year | 1·00 | 1·00,1·00 | 0·303 | |||
| Age group (years) | ||||||
| 15–29 | Ref | See Fig. 3a | ||||
| 30–44 | 0·80 | 0·64,1·00 | 0·048 | |||
| 45–59 | 0·65 | 0·50,0·84 | 0·001 | |||
| 60+ | 0·54 | 0·39,0·74 | <0·0001 | |||
| 30–44 years by Year | 1·00 | 0·98,1·02 | 0·876 | |||
| 45–59 years by Year | 1·00 | 0·97,1·02 | 0·856 | |||
| 60+ years by Year | 1·03 | 1·00,1·06 | 0·033 | |||
| Gender | ||||||
| Female | Ref | See Fig. 3b | ||||
| Male | 0·65 | 0·55,0·78 | <0·0001 | |||
| Male by year | 1·02 | 1·00,1·04 | 0·013 | |||
| Socioeconomic disadvantage | ||||||
| Most | 1·09 | 0·98,1·20 | 0·099 | 37·1 | 35·7,38·4 | 0·098 |
| Least | Ref | 35·4 | 33·9,36·9 | |||
| Region | ||||||
| Metropolitan | Ref | 36·4 | 35·2,37·5 | |||
| Country | 0·99 | 0·89,1·10 | 0·852 | 36·2 | 34·3,38·0 | 0·852 |
| Heaviness of smoking | ||||||
| 10 or fewer cigarettes per day | Ref | 39·6 | 38·0,41·2 | |||
| More than 10 per day | 0·84 | 0·76,0·93 | 0·001 | 36·1 | 34·7,37·4 | 0·001 |
| Quantity not provided | 0·43 | 0·35,0·52 | <0·0001 | 23·5 | 20·6,26·4 | <0·0001 |
| Quit intentions in next 6 months | ||||||
| Intend to quit | Ref | See Fig. 3c | ||||
| Do not intend to quit | 0·24 | 0·20,0·30 | <0·0001 | |||
| Can't say | 0·50 | 0·37,0·66 | <0·0001 | |||
| Do not intend to quit by Year | 0·98 | 0·96,1·00 | 0·036 | |||
| Can't say by Year | 0·97 | 0·95,1·00 | 0·039 | |||
| Mental health condition | 2005 to 2017 (n = 6785) | |||||
| No | Ref | 36·1 | 34·6,37·5 | |||
| Yes | 1·15 | 0·98,1·35 | 0·083 | 38·9 | 35·9,41·8 | 0·085 |
^
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.