Table 3

Zero-order correlation matrix for all study variables

	1	2	3	4	5	6	7	8	9	10	11	12	13	14
1. Age	1.00
2. Gender (0=female, 1=male)	0.02	1.00
3. SES	−0.07*	0.02	1.00
4. Region (0=west, 1=east)	0.25***	−0.01	−0.10*	1.00
5. School performance	0.11***	0.03	−0.16***	−0.05	1.00
6. TV screen time	0.17***	0.07**	−0.30***	0.25***	0.15***	1.00
7. Sensation seeking	0.09***	0.24***	−0.03	0.01	0.16***	0.18***	1.00
8. Peer smoking	0.28***	0.02	−0.22***	0.28***	0.15***	0.24***	0.24***	1.00
9. Parent smoking	0.04	−0.02	−0.26***	0.09***	0.11**	0.22***	0.08**	0.17***	1.00
10. Tobacco ad exposure	0.14***	0.13***	0.02	−0.06*	0.05	0.11**	0.24***	0.13***	0.08**	1.00
11. Non-tobacco ad exposure	0.20***	0.05	−0.08**	0.11**	0.06*	0.36***	0.21***	0.18***	0.18***	0.44***	1.00
12. Ever smoking	0.15***	0.01	−0.17***	0.14***	0.09**	0.14***	0.18***	0.24***	0.13***	0.19***	0.15***	1.00
13. Past 30 days smoking	0.09**	−0.02	−0.12**	0.08**	0.06*	0.12**	0.15***	0.21***	0.14***	0.17***	0.12***	0.61***	1.00
14. Established smoking (>100 cig.)	0.07*	0.09**	−0.07*	0.08**	0.05	0.10*	0.12**	0.16***	0.09***	0.13***	0.09**	0.33***	0.51***	1.00
15. Daily smoking	0.02	0.04	−0.14***	0.08**	0.07*	0.10*	0.09**	0.14***	0.13***	0.08**	0.03	0.30***	0.49***	0.75***

Italic figures represent significant associations.
*p<0.05; **p<0.01; ***p<0.001.
SES, socioeconomic status.