Table 3

Trends in youth smoking prevalence: Massachusetts campaign 1993 to present

		Grades		Reported 30 day smoking prevalence				Change in smoking prevalence 1993-1995			Reported 30 day smoking prevalence 1997			Change in smoking prevalence 1995-1997			Reported 30 day smoking prevalence 1999			Change in smoking prevalence 1997-1999
		Grades		1993	1995			Change in %	Relative risk		Reported 30 day smoking prevalence 1997			95% CI for relative risk	Change in %		Reported 30 day smoking prevalence 1999			Relative risk	95% CI for relative risk	Change in %	Relative risk	95% CI for relative risk
Massachusetts	10th	25.2	34.8			+9.6^3-150	1.38^3-150	1.20 to 1.60		35.8		+1.0	1.03	0.91 to 1.16		29.2		−6.6^3-150	0.82^3-150	0.72 to 0.92
Northeast region^3-151	10th	27.1	27.8			+.7	1.03	0.88 to 1.20		29.3		+1.5	1.05	0.91 to 1.22		28.0		−1.3	0.96	0.82 to 1.11

Massachusetts	12th	35.9	39.1			+3.2	1.09	0.97 to 1.23		40.2		+1.1	1.03	0.92 to 1.14		36.9		−3.3	0.92	0.82 to 1.02
Northeast region	12th	34.2	34.4			+.2	1.01	0.87 to 1.16		40.6		+6.2^3-150	1.18^3-150	1.04 to 1.34		34.2		−6.4^3-150	0.84^3-150	0.74 to 0.96

Source: Massachusetts youth risk behavior survey (MYRBS), a school based survey developed in conjunction with CDC. Monitoring the Future data are provided for regional comparison.^65,72
↵3-150 p ⩽ 0.05
↵3-151 Census data indicates that Massachusetts represents roughly 11% of the northeast region population.