Table 2.

Vaping advertisements in the areas surrounding London, Ontario, secondary schools before and after the January 1, 2020 ban on vaping advertisements at convenience stores and gas stations, n = 18

	Mean (SD) pre-ban advertisements	Mean (SD) post-ban advertisements	Average change	p
Count—unweighted
400 m	2.9 (3.8)	0.5 (1.2)	− 2.4	< 0.05
800 m	18.1 (20.7)	3.6 (6.1)	− 14.5	< 0.001
Count—weighted by the number of retailers with ads/total number of retailers
400 m	1.9 (2.9)	0.1 (0.4)	− 1.8	< 0.05
800 m	12.2 (14.5)	0.8 (1.7)	− 11.4	< 0.01
Density—advertisements per km2
400 m	3.3 (4.3)	0.6 (1.6)	− 2.7	< 0.05
800 m	6.8 (8.5)	1.4 (2.4)	− 5.5	< 0.01

SD, standard deviation