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Table 3 The relationship between measures of body mass index and body composition and frequency of sports participation

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 = 77.92; p < .001

Wald Chi-Squared = 85.47; p < .001

Wald Chi-Squared = 85.47; 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

Sports Frequency (reference: daily)

 Never

2.222 [0.977–5.052]

.057

2.485 [0.961–6.429]

.060

1.816 [0.619–5.328]

.277

 Less than weekly

0.435 [0.236–0.802]

.008**

0.466 [0.210–1.341]

.061

0.455 [0.214–0.969]

.041**

 Weekly

0.970 [0.750–1.256]

.819

0.967 [0.697–1.341]

.841

0.945 [0.676–1.321]

.741

 Most days

0.911 [0.707–1.174]

.471

0.998 [0.728–1.369]

.990

0.832 [0.596–1.162]

.281

Sex (reference: female)

 Male

0.843 [0.687–1.035]

.102

0.975 [0.754–1.261]

.846

1.063 [0.815–1.386]

.654

Age at test

1.110 [1.041–1.183]

.001**

1.005 [0.928–1.089]

.903

1.030 [0.947–1.120]

.486

Ethnicity (reference: white/other)

 Black

1.563 [1.183–2.066]

.002**

1.809 [1.268–2.580]

.001**

1.612 [1.130–2.300]

.008**

 South Asian

0.607 [0.452–0.815]

.001**

1.306 [0.920–1.854]

.136

0.253 [0.157–0.408]

<.001***

Family Affluence Scale (reference: low)

 Moderate

1.209 [0.816–1.792]

.344

1.344 [0.818–2.209]

.244

1.491 [0.892–2.492]

.127

 High

1.107 [0.692–1.771]

.671

1.728 [0.959–3.112]

.069

1.940 [1.052–3.574]

.034*

Free school lunches (reference: no)

 Yes

1.426 [1.087–1.870]

.010*

1.681 [1.211–2.334]

.002**

1.582 [1.114–2.247]

.010*

Cars owned (reference: 0)

 1

0.988 [0.749–1.305]

.934

1.040 [0.737–1.466]

.824

0.987 [0.690–1.411]

.941

 2

1.052 [0.731–1.513]

.787

0.872 [0.550–1.381]

.559

0.674 [0.414–1.097]

.113

Multiple Deprivation Index (reference: low)

 Intermediate

1.275 [0.914–1.780]

.153

1.116 [0.735–1.696]

.607

1.318 [0.846–2.053]

.222

 High

1.385 [0.979–1.960]

.066

1.384 [0.910–2.103]

.129

1.314 [0.828–2.085]

.246

Level 2: Variance on School Level

0.053 [0.012–0.227]

 

0.048 [0.008–0.298]

 

0.112 [0.026–0.479]

 
  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