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Table 4 Multivariable logistic regression results for smoking and physical and social environmental characteristics associated with quitting behaviour and motivation

From: Smoking and environmental characteristics of smokers with a mental illness, and associations with quitting behaviour and motivation; a cross sectional study

Predictor % (n) OR 95 % CI
Lower Upper
Model 1: Quit attempt in the past 6 monthsa
Smoking status
 Weekly/Irregular 7.0 (53) 2.07* 1.17 3.64
 Daily 93.0 (701) Ref   
Years smoked
  ≤ 10 18.3 (138) 1.65* 1.11 2.47
 11–20 26.9 (203) 0.99 0.68 1.43
  > 20 54.8 (413) Ref   
Model 2: Number of quit attempts in the past 6 monthsb
Perceived support from psychiatrist
 Supportive 54.7 (128) 2.83** 1.64 4.88
 Unsupportive/not applicable 45.3 (106) Ref   
Model 3: Duration of quit attempt in the past 6 monthsc
Lived with smokers
 No 56.4 (132) 2.02* 1.002 4.06
 Yes 43.6 (102) Ref   
Cigarettes per day
 1–10 32.9 (77) 16.23* 2.05 128.24
 11–20 34.2 (80) 4.23 0.52 34.61
 21–30 21.8 (51) 5.88 0.70 49.50
 31+ 11.1 (26) Ref   
Model 4: Readiness to quitd
Age initiated smoking
  ≥ 14 years old 57.3 (432) 1.40* 1.04 1.87
  < 14 years old 42.7 (322) Ref   
Model 5: Identity as a smokere
Smoking status
 Weekly/Irregular 7.0 (53) 2.79* 1.47 5.29
 Daily 93.0 (701) Ref   
Nicotine dependence
 Low- moderate 48.8 (368) 2.34** 1.72 3.18
 High 51.2 (386) Ref   
Number of years smoked
  ≤ 10 18.3 (138) 2.34** 1.55 3.52
 11–20 26.9 (203) 1.24 0.87 1.77
  > 20 54.8 (413) Ref   
  1. a(reference: no); b(reference: one quit attempt; only participants who had attempted to quit were included); c(reference: < 1 month; only participants who has attempted to quit were included); d(reference: precontemplative); e(reference: difficult to see self as non-smoker); *p < 0.05, ** p <0.001; Ref: reference category