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Table 4 The relationship between measures of body mass index and body composition and mode of commuting

From: Associations of extracurricular physical activity patterns and body composition components in a multi-ethnic population of UK children (the Size and Lung Function in Children study): a multilevel modelling analysis

Variable BMI z-score percentile categories ln(FMI) z-score percentile categories FFMI z-score percentile categories
Wald Chi-Squared = 82.02; p < .001 Wald Chi-Squared = 46.21; p < .001 Wald Chi-Squared = 87.64; p < .001
Level 1 O.R. [95% C.I.] p-value O.R. [95% C.I.] p-value O.R. [95% C.I.] p-value
Commuting mode (reference: passive)
 Mixed 0.471 [0.112–1.979] .304 0.584 [0.099–3.463] .554 0.751 [0.138–4.076] .740
 Active 0.678 [0.531–0.865] .002** 0.679 [0.499–0.922] .013* 0.918 [0.665–1.267] .603
 Disagreement 1.028 [0.769–1.375] .850 0.994 [0.696–1.419] .972 1.451 [0.998–2.110] .051
Sex (reference: female)  
 Male 0.856 [0.698–1.050] .136 0.987 [0.763–1.275] .918 1.085 [0.833–1.414] .546
Age at test 1.118 [1.049–1.191] .001** 1.012 [0.935–1.095] .770 1.034 [0.951–1.123] .436
Ethnicity (reference: white/other)
 Black 1.459 [1.104–1.927] .008** 1.698 [1.191–2.420] .003** 1.547 [1.084–2.209] .016*
 South Asian 0.606 [0.453–0.813] .001** 1.302 [0.924–1.837] .132 0.248 [0.153–0.401] <.001***
Family Affluence Scale (reference: low)
 Moderate 1.093 [0.738–1.618] .658 1.208 [0.737–1.981] .453 1.382 [0.827–2.307] .217
 High 1.024 [0.641–1.638] .920 1.574 [0.875–2.832] .130 1.888 [1.026–3.474] .041*
Free school lunches (reference: no)  
 Yes 1.412 [1.078–1.851] .012* 1.633 [1.178–2.265] .003** 1.534 [1.081–2.177] .017*
Cars owned (reference: 0)
 1 0.961 [0.727–1.269] .777 1.008 [0.713–1.426] .964 0.990 [0.691–1.417] .955
 2 0.978 [0.679–1.409] .904 0.819 [0.515–1.300] .397 0.664 [0.407–1.082] .100
Multiple Deprivation Index (reference: low)
 Intermediate 1.265 [0.910–1.760] .162 1.132 [0.747–1.714] .559 1.317 [0.849–2.043] .219
 High 1.407 [1.010–1.961] .043* 1.417 [0.949–2.116] .089 1.332 [0.846–2.097] .216
Level 2: Variance on School Level 0.045 [0.009–0.210]   0.036 [0.005–0.291]   0.092 [0.019–0.441]  
  1. O.R. Odds Ratio, C.I. Confidence Interval, BMI Body Mass Index, FMI Fat Mass Index, FFMI Fat-Free Mass Index
  2. *: p < .05; **: p < .01; ***: p < .001
  3. Significant associations (p < .05) on the first level of the multilevel model are in bold