Table 2.

Factors associated with overall tobacco use among adolescents for both survey years by univariate logistic regression analysis

Covariates	Survey Year 2007		Survey Year 2013
	Odds Ratio (95% CI)	P-value	Odds Ratio (95% CI)	P-value
Sex
Female	1		1
Male	2.11 [1.09–4.07]	0.028	3.45 [1.73–6.90]	0.001
Age
Younger than 14 years	1		1
Equal to 14 years	1.09 [0.69–1.73]	0.689	1.61 [0.90–2.87]	0.102
Older than 14 years	2.32 [1.30–4.14]	0.006	3.26 [1.48–7.18]	0.005
Grade
7th	1		1
8th	1.43 [0.58–3.50]	0.422	1.48 [0.75–2.90]	0.246
9th or above	1.82 [0.74–4.51]	0.185	1.75 [0.55–5.57]	0.334
Average pocket money (per month)
Less than or equal to 160 TK	1
More than 160 TK	4.80 [2.63–8.78]	<.0001
Spend less than or equal to 400 TK			1
Spend between 400 and 800 TK			4.82 [0.89–26.10]	0.067
Spend more than or equal to 800 TK			1.98 [0.28–13.71]	0.477
Aware of the effect of passive smoking
Yes	1		1
No	1.48 [0.72–3.05]	0.273	0.641 [0.22–1.84]	0.393
Favoured banning smoking at public places
Yes	1		1
No	1.10 [0.52–2.31]	0.793	1.92 [1.06–3.50]	0.034
Refused by the tobacco vendor for age
Yes	2.16 [1.04–4.51]	0.040	0.25 [0.06–1.06]	0.060
No	1
Average cost per packet cigarette (20 cigarettes)
Less than 64TK	1
More than or equal to 64 TK	3.00 [0.94–9.54]	0.061
More than 200 Tk			1
Less than or equal to 75 TK			2.54 [0.79–8.17]	0.112
Between 76 to 200 TK			7.38 [3.22–16.92]	<.001
Received anti-tobacco message
Yes	1.72 [0.61–4.88]	0.295	1.05 [0.31–3.62]	0.934
No	1		1
Health warning on tobacco products
Yes			2.37 [1.14–4.91]	0.022
No			1
Noticed anyone smoking in the school
Yes			1
No			2.42 [1.45–3.95]	0.001
Being offered free tobacco products
Yes	2.68 [1.46–4.91]	0.003	0.66 [0.14–3.12]	0.588
No	1		1
Taught about danger of tobacco in class
Yes	1		1
No	1.21 [0.78–1.90]	0.380	1.07 [0.46–2.50]	0.868
Tobacco advertisement
Yes	1.56 [0.57–4.29]	0.376	1.50 [0.81–2.80]	0.191
No	1		1
Exposed to tobacco smoke
Yes	4.06 [1.90–8.66]	0.001	7.91 [2.74–22.90]	0.001
No	1		1

CI Confidence Interval. TK: Bangladeshi currency (1 USD ≈ 85 TK)