Dr. Blum conducts a study examining the relationship between health behaviors and anxiety in elementary school children. She predicts that physical activity is very important, but that other factors need to be considered such as sleep and screen time. Below are results from her multivariable regression analysis. When considering all predictor variables together, which variable is the strongest relative predictor of Anxiety?

Coefficients Standardized Unstandardized Coefficients Coefficients Model B Std. Error Beta Sig. (Constant) 18.639 3.040 6.131 000 StepsPerDay -.006 .001 -.551 -12.465 000 SleepPerNight -.706 066 -.411 -10.652 000 ScreenPerDay .191 .220 028 869 386 a. Dependent Variable: Anxiety