Q1-2 Researchers looked at predictors of high BMI in children aged 9 through 11 years. In the plots below, BMI is measured in standard deviation units (Z scores). For example, = BMI Z score of 0.B means that the individual has = BMI Q.8 standard deviations above average. A Long sleep Short sleep 0.8 50.6 BMI z-score 0.4 0.2 Active Inactive B 0.8 Long Sleep Short Sleep 0.6 BMI z-score 0.4 0.2 Low Screen Time High Screen Time Healthy Diet 0.8 Mixed Diet Unhealthy Diet 0.6 BMI z-score 1.4 - 0.2 -0.2 Active Inactive Wilkie HJ, Standage M. Gillison FB, etal. Multiple lifestyle behaviours and overweight and obesity among children aged 9-11 years: results from the UK site of the International Study of Childhood Obesity, Lifestyle and the Environment BMJ Open 2016:4:6010477. doi: 10.1136/bmjapan-2015-010677 1 1 point What is the linear regression equation that corresponds to plot A if the reference group is active, long sleepers? Expected BMI Z score - 0.2- 0.05"[1 if shortsleep, 0 if long sleep] + 0.6-[1 if inactive, O if active) Expected BMI Z score - 0.8 + 0.05 [1 if short sleep, 0 if long sleep) - 0.2"(1 if inactive. 0 if active) - 0.45"(1 if inactive and short sleeper, O otherwise] Expected BMI Z score - 0.2- 0.05"[1 if shortsleep, 0 if long sleep) + 0.2"[1 if inactive, O if active) + 0.45"[1 if inactive and short sleeper, 0 otherwise) Expected BMI Z score - 0.2- 0.05-[1 if shortsleep, ( if long sleep) - 0.2"[1 if inactive, O if active] - 0.45*(1 if inactive and short sleeper, ( otherwise] 2 1 point The interaction between short sleep and inactivity is statistically significant (palt; 05]. Which of the following statements is an accurate description of the interaction? Getting too little sleep has a bigger effect on BMI among children who are inactive. Being inactive has a bigger effect on BMI among children who get too little sleep. The effect of sleep on weight is modified by activity level. All of the above