Table 3.

Association Between Exposure to Any Flavored Tobacco Sales Restrictions and Student E-cigarette Use, CHKS 2017/2018 and 2019/2020

	Pre-policy 2017/2018	Post-policy 2019/2020	Post compared with pre-policy
			Unadjusted (n = 86 958)			Adjusteda (n = 77 760)
			OR (95% CI)	D-I-D OR (95% CI)	p b	OR (95% CI)	D-I-D OR (95% CI)	p b
Current e-cigarette use
Exposed	10.5	11.1	1.06 (0.84, 1.36)	1.22 (0.94, 1.58)	.14	1.12 (0.86, 1.45)	1.25 (0.95, 1.65)	.11
Unexposed	12.8	11.4	0.88 (0.79, 0.98)	ref		0.90 (0.81, 1.00)	ref
Almost daily e-cigarette use c
Exposed	20.8	22.7	1.12 (0.81, 1.55)	0.94 (0.66, 1.33)	.71	1.27 (0.91, 1.79)	1.01 (0.71, 1.46)	.94
Unexposed	21.2	24.3	1.19 (1.06, 1.34)			1.25 (1.10, 1.42)
Ever e-cigarette use
Exposed	20.8	21.5	1.04 (0.91, 1.18)	1.05 (0.90, 1.22)	.51	1.08 (0.91, 1.27)	1.06 (0.89, 1.26)	.52
Unexposed	24.0	23.8	0.99 (0.91, 1.07)			1.02 (0.94, 1.09)	ref
Ever used marijuana in an e-cigarette
Exposed	16.9	20.6	1.27 (1.14, 1.42)	1.04 (0.91, 1.18)	.59	1.35 (1.19, 1.53)	1.05 (0.91, 1.21)	.53
Unexposed	17.6	20.8	1.23 (1.14, 1.32)	ref		1.29 (1.20, 1.39)	ref
Access to e-cigarettes
Easy to obtain
Exposed	30.6	39.2	1.46 (1.17, 1.84)	1.01 (0.78, 1.29)	.96	1.57 (1.27, 1.95)	1.02 (0.81, 1.29)	.85
Unexposed	34.6	43.5	1.46 (1.30, 1.62)	ref		1.54 (1.39, 1.70)	ref

Abbreviations: CHKS, California Healthy Kids Survey; D-I-D, Differences in differences analysis; OR, odds ratio.

Bold values indicate statistically significant odds ratios comparing pre- to post-policy change in each outcome (p < .05).

Adjusted for gender, grade, race/ethnicity, sexual orientation, parent education, type of home, home language, term, school size, percent of school eligible for Free or Reduced Price Meals, population density, and the number of tobacco retailers within 1000’ of a school.

p-value for interaction term between year and FTSR exposure status.

20–30 times/month among current users (n = 10 304).