Table A4b.

Adjusted Relative Risks of Any Tobacco 21 Coverage on Smoking by Grade, Monitoring the Future, 2014–2019. Results Shown are using Complete Cases.

	8th gradersa	10th gradersa	12th gradersb
	ARR(95% CI)	ARR(95% CI)	ARR(95% CI)
Smoking participation
Any T21 Coverage	0.91 (0.68,1.21)	0.90 (0.71,1.13)	0.82 (0.67,1.00)
N	70,649	74,750	63,928
First cigarette initiation
Any T21 Coverage	0.93 (0.66,1.31)	0.74* (0.56,0.97)	0.87 (0.64,1.20)
N	59,052	59,735	22,222
Daily smoking initiation
Any T21 Coverage	0.94 (0.57,1.56)	0.77 (0.51,1.18)	0.89 (0.52,1.52)
N	65,061	69,189	27,560

^aRegression models estimating adjusted risk ratios controlled for gender, age, race/ethnicity, parents’ highest education, living arrangement, mother’s employment, high school program type, hours worked per week, weekly earnings from allowances or other sources, grade of smoking cigarette for first time, grade of starting daily smoking, having 5 or more drinks in a row over the past 2 weeks, marijuana use in the past 30 days, the year of survey administration, census region, cigarette taxes, workplace smoke-free policy coverage, restaurant and bar (hospitality) smoke-free policy coverage, percentage of individuals in state in poverty, percentage of individuals in state that are Black, percentage of individuals in state that are Hispanic or Latino.

^b12^th grade adjusted regression models controlled for all variables included in 8th and 10th grade models, as well as college plans.