Table 5.

Relationship between exposure to advertising and tobacco use by grade^a

Grade 6	0 PLACES (n=959)	1–4 PLACES (n=2702)	> 4 PLACES (n=1943)		Grade 8	0 PLACES (n=480)	1–4 PLACES (n=2699)	> 4 PLACES (n=2094)
	Percentage	Percentage	Percentage	P-valueb		Percentage	Percentage	Percentage	P-valueb
Ever use of any tobacco	19.4 (± 3.2)	23.0 (± 2.6)	23.3 (± 2.8)	< 0.05	Ever use of any tobacco	11.6 (± 3.0)	8.6 (± 1.6)	10.2 (± 1.8)	< 0.05
Current use of any tobacco	3.0 (± 2.0)	6.3 (± 1.6)	7.2 (± 1.6)	< 0.01	Current use of any tobacco	2.2 (± 1.8)	2.5 (± 0.8)	3.3 (± 1.0)	0.20

^aEstimates generated from mixed-effects models adjusted for city, school type, gender, and age.

^bP value for trend