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. 2012 Jun 13;9(6):2189–2203. doi: 10.3390/ijerph9062189

Table 4.

Statistically significant predictors of ever littering cigarette butts among smokers (n = 1,000).

Bivariate Multivariate *
OR 95%CI OR 95%CI
Cigarette butts are biodegradable
Strongly Disagree/Disagree/DK Ref Ref
Strongly Agree/ Agree 1.47 (1.02, 2.13) 1.32 (0.91, 1.92)
Do you consider cigarette butts to be litter?
No/DK 3.83 (2.13, 6.93) 3.68 (2.04, 6.66)
Yes Ref Ref

Ever littering = ever disposing of cigarette butts by dropping them on the ground or throwing/dropping them out of a car window. * The multivariate model includes only those significant variables in bivariate analysis. OR = Odds ratio; Ref = referent.