Table 3.

Prevalence of weight-control behaviors and overweight among 9^th and 12^th grade students enrolled at a cohort of 42 Minnesota schools, 2007 (n=10,184 students) to 2010 (9,505 students)

	Females:				Males:
	mean±SDa		β (SE)b	P valuec	mean±SDa		β (SE)b	P valuec
	2007	2010			2007	2010
Weight-control behaviors
Extreme behaviorsd	8±4	6±4	−0.014 (0.006)	0.021	4±2	3±2	−0.005 (0.005)	0.32
Unhealthy behaviorse	29±8	25±8	−0.042 (0.013)	0.001	14±6	13±5	−0.018 (0.010)	0.08
Healthy behaviorsf	72±7	68±8	−0.041 (0.014)	0.003	46±7	43±11	−0.025 (0.019)	0.18
Overweight status (≥85th percentile)	18±6	18±7	−0.001 (0.011)	0.91	28±6	27±9	−0.009 (0.013)	0.49

^aSD=standard deviation

^bβ represents the slope of change over time, SE=standard error

^cP values represent test for secular trend.

^dExtreme behaviors included use of diet pills, speed, or other drugs; vomiting on purpose after eating; and use of laxatives.

^eUnhealthy behaviors included fasting or skipping meals and smoking cigarettes.

^fHealthy behaviors included exercising and eating healthier.