Table 2.

Prevalence^a of select food practices, alternative and regular public secondary schools, Minnesota, 2002–2008

Food Practice	School Type	Prevalencea 2002	Prevalencea 2008	Change in prevalencea (confidence interval) within school type 2002–2008	p-value for change over time	p-value for difference between school typeb
Vending machines/school stores	Alternative (n=137c)	98.1%	89.8%	−8.3% (−4.6%, −1.9%)	0.0107	0.2429
	Regular (n=561c)	97.0%	85.5%	−11.5% (−17.8%, −5.3%)	0.0003
Sugar-sweetened beverages	Alternative (n=125c)	99.3%	96.0%	−3.3% (−7.2%, 0.7%)	0.1025	0.3702
	Regular (n=514c)	98.7%	92.9%	−5.8% (−11.0%, −0.6%)	0.0292
High fat, salty snacks	Alternative (n=123c)	97.3%	74.4%	−22.9% (−33.1%, −12.7%)	< 0.0001	0.0001
	Regular (n=512c)	92.4%	50.2%	−42.2% (−51.5%, −32.9%)	< 0.0001
Candy	Alternative (n=122c)	94.1%	70.9%	−23.2% (−33.3%, −13.2%)	< 0.0001	0.1272
	Regular (n=513c)	91.3%	61.7%	−29.6% (−38.6%, −20.6%)	< 0.0001

^aFrom logistic regression models adjusted for school grade level (dichotomized as high grade 11 or 12 and low grade 9 versus high grade 11 or 12 and low grade 4–8), location (defined using a combination of National Center for Education Statistics (NCES) Common core data and Rural Urban Commuting Area classification schemes)^{26, 27} and percent free/reduced price lunch eligibility and percent minority enrollment defined using NCES Common core data criteria.²⁶

^bDifferences between school type (alternative and regular) are averaged over all years.

^cn = total number of observations over time not the total number of unique schools; n varies for models due to missing data for some items