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Table 5 Relationship between after-school physical activity and body composition variables a

From: Sizing the association between lifestyle behaviours and fatness in a large, heterogeneous sample of youth of multiple ethnicities from 4 countries

   New Zealand Fiji Tonga Australia All
  Days Pacific (N = 830) Maori (N = 370) Asian (N = 138) European (N = 239) All New Zealand (N = 1577) Indigenous Fijian (N = 600) Fijian Indian (N = 791) All Fiji (N = 1391) Tongan (N = 1019) Australian (N = 1673) All (N = 5660)d
Mean BMIb 4-5 24.45 (0.20) 23.95 (0.21) 20.29 (0.43) 21.34 (0.33) 23.47 (0.15) 21.47 (0.11) 18.83 (0.15) 19.98 (0.10) 22.17 (0.14) 20.66 (0.10) 21.54 (0.06)
Increment in BMIc 2-3 0.89 (0.18) -0.24 (0.23) 0.13 (0.37) 0.41 (0.41) 0.50 (0.18)* 0.03 (0.16) 0.09 (0.26) 0.05 (0.14) 0.16 (0.16) 0.16 (0.14) 0.23 (0.08)
0-1 1.58 (0.15) 0.63 (0.39) 0.22 (0.42) 0.33 (0.20) 0.97 (0.23) 0.57 (0.25)* -0.02 (0.21) 0.21 (0.18) 0.49 (0.17) -0.01 (0.09) 0.46 (0.12)
Mean BMIzb 4-5 1.24 (0.04) 1.08 (0.04) 0.03 (0.14) 0.29 (0.04) 0.95 (0.03) 0.36 (0.04) -0.69 (0.05) -0.23 (0.04) 0.67 (0.04) 0.29 (0.03) 0.41 (0.02)
Increment in BMIzc 2-3 0.16 (0.04) -0.06 (0.08) -0.05 (0.12) 0.12 (0.14) 0.09 (0.04) -0.01 (0.06) 0.03 (0.10) 0.01 (0.06) 0.01 (0.05) 0.03 (0.04) 0.04 (0.02)
0-1 0.30 (0.04) 0.08 (0.08) -0.02 (0.13) 0.08 (0.08) 0.17 (0.05)* 0.13 (0.07) -0.02 (0.07) 0.04 (0.06) 0.11 (0.05)* -0.03 (0.03) 0.08 (0.03)
Mean %BFb 4-5 29.06 (0.32) 29.67 (0.52) 20.63 (1.50) 23.09 (1.11) 27.62 (0.28) 19.60 (0.39) 22.06 (0.36) 21.04 (0.30) 21.36 (0.64) 25.55 (0.43) 24.15 (0.19)
Increment in %BFc 2-3 1.16 (0.42) -0.27 (0.50) 0.93 (1.50) 3.03 (0.94) 0.99 (0.31)* 0.77 (0.47) 0.38 (0.79) 0.50 (0.45) 0.89 (0.46) 0.81 (0.43) 0.92 (0.21)
0-1 3.88 (0.56) 0.02 (1.03) 1.72 (0.82)* 1.61 (0.50) 2.12 (0.63)* 2.06 (0.60) 0.25 (0.58) 0.94 (0.41)* 2.39 (0.50) 1.32 (0.47) 1.96 (0.29)
Mean TFMb 4-5 21.27 (0.50) 21.44 (0.62) 11.36 (1.30) 14.36 (1.20) 19.42 (0.35) 11.68 (0.31) 10.94 (0.31) 11.30 (0.25) 13.23 (0.44) 14.59 (0.28) 14.82 (0.16)
Increment in TFMc 2-3 1.69 (0.53) -0.45 (0.38) 0.80 (1.17) 2.64 (0.82) 1.18 (0.35)* 0.51 (0.37) 0.33 (0.55) 0.36 (0.31) 0.66 (0.37) 0.66 (0.36) 0.78 (0.18)
0-1 4.42 (0.57) 0.97 (1.31) 1.29 (0.76) 1.28 (0.63)* 2.53 (0.64) 1.62 (0.53) 0.20 (0.43) 0.71 (0.36) 1.76 (0.42) 0.76 (0.26) 1.64 (0.29)
  1. aAdjusted for age and sex. “New Zealand All”, “Fiji All” and “All countries” were further adjusted for ethnicity; bStandard error in parentheses; cCompared to “4-5 days” (reference category). Standard error in parentheses; dR2 for BMI, BMIz, %BF and TFM models = 0.317, 0.313, 0.247 and 0.230, respectively; BMI = Body mass index (kg/m2); BMIz = BMI z-score; %BF = Percent body fat (%); TFM = Total fat mass (kg); *P<0.05; P <0.01; P <0.001.