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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

From: Longitudinal changes in body composition and waist circumference by self-reported levels of physical activity in leisure among adolescents: the Tromsø study, Fit Futures

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)*
  1. *Significantly different from the reference (p < 0.05)
  2. aChange in outcome in categories of activity status relative to quitting activity as reference. Model 1 adjusted for baseline measurement of outcome. Model 2 adjusted for baseline measurement of outcome, screen time on weekdays, regularity of eating breakfast, age in half years at baseline and days between measurements
  3. bBoys quitting activity had a mean increase of 1.5 BMI units, 4.1 cm waist circumference, 1.0 FMI units and 0.3 LMI units
  4. cGirls quitting activity had a mean increase of 1.0 BMI units, 1.4 cm waist circumference, 0.9 FMI units and − 0.1 LMI units
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