Table 4 Difference in BMI (kg/m2), waist circumference, FMI (fat mass in kg/m2) and LMI (lean mass in kg/m2) between Fit Futures 1 (2010–2011) and Fit Futures 2 (2012–2013) according to change in activity status between the surveysa
Boys | n | Beta for ∆BMI (95% CI) | Beta for ∆waist circumference (95% CI) | Beta for ∆FMI (95% CI) | Beta for ∆LMI (95% CI) | ||||
Change in activity status | 278 | Model 1 | Model 2 | Model 1 | Model 2 | Model 1 | Model 2 | Model 1 | Model 2 |
Quittersb | 50 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Consistently inactive | 76 | − 0.15 (−0.82, 0.53) | − 0.06 (− 0.73, 0.61) | 0.11 (− 2.21, 2.44) | 0.29 (− 2.04, 2.63) | − 0.08 (− 0.70, 0.54) | −0.02 (− 0.64, 0.61) | − 0.02 (− 0.30, 0.27) | 0.01 (− 0.28, 0.29) |
Adopters | 33 | − 0.69 (− 1.53, 0.15) | −0.78 (− 1.61,0 0.05) | −1.89 (− 4.79, 1.00) | −2.10 (− 5.00, 0.81) | − 1.01 (− 1.78, − 0.23)* | −1.06 (− 1.83, − 0.28)* | 0.32 (− 0.04, 0.67) | 0.29 (− 0.06, 0.65) |
Consistently active | 119 | −0.31 (− 0.94, 0.31) | −0.54 (− 1.19, 0.11) | −1.35 (− 3.49, 0.80) | − 2.02 (− 4.28, 0.24) | − 0.50 (− 1.07, 0.08) | −0.63 (− 1.24, − 0.03)* | 0.20 (− 0.07, 0.47) | 0.14 (− 0.14, 0.42) |
Girls | |||||||||
Change in activity status | 348 | ||||||||
Quittersc | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Consistently inactive | 86 | − 0.14 (−0.70, 0.43) | − 0.14 (− 0.72, 0.43) | − 0.48 (−2.70, 1.75) | − 0.39 (− 2.65, 1.88) | − 0.30 (− 0.81, 0.21) | −0.31 (− 0.82, 0.21) | 0.10 (− 0.11, 0.30) | 0.09 (− 0.12, 0.30) |
Adopters | 39 | − 0.09 (− 0.80, 0.63) | − 0.09 (− 0.80, 0.63) | − 0.84 (− 3.64, 1.96) | − 0.90 (− 3.71, 1.90) | − 0.39 (−1.04, 0.25) | −0.40 (− 1.04, 0.24) | 0.32 (0.07, 0.58)* | 0.32 (0.07, 0.58)* |
Consistently active | 143 | − 0.36 (− 0.87, 0.16) | − 0.29 (− 0.82, 0.24) | − 0.52 (− 2.53, 1.49) | − 0.41 (− 2.49, 1.68) | − 0.60 (− 1.06, − 0.14)* | −0.53 (− 1.00, − 0.05)* | 0.23 (0.05, 0.41)* | 0.22 (0.03, 0.41)* |