Table 3

Linear regression analysis for lumbar spine bone mineral content as regards to sedentary behaviours
Boys (n=178) Girls (n=181)
Model 1: Adjusted by height and sexual maturation
Sedentary behaviours βa Partial Corrb p βa Partial Corrb P
TV viewing c −0.049 −0.066 0.381 0.064 0.082 0.289
Use of computer games c 0.068 0.093 0.224 −0.081 −0.103 0.188
Use of console games d −0.008 −0.013 0.884 −0.071 −0.085 0.593
Use of internet for non-study d −0.022 −0.030 0.720 −0.005 −0.006 0.940
Use of internet for study d −0.054 −0.072 0.424 0.069 0.088 0.303
Time of study c −0.061 −0.084 0.274 −0.109 −0.139 0.072
Total sedentary time d −0.073 −0.119 0.127 −0.073 −0.094 0.238
Model 2: Model 1 + lean mass
TV viewing c −0.010 −0.017 0.828 0.048 0.065 0.400
Use of computer games c 0.013 0.022 0.777 −0.083 −0.113 0.150
Use of console games d 0.024 0.044 0.616 −0.017 −0.021 0.897
Use of internet for non-study d 0.011 0.018 0.813 −0.034 −0.046 0.557
Use of internet for study d −0.059 −0.101 0.259 0.098 0.132 0.123
Time of study c 0.010 0.016 0.833 −0.056 −0.074 0.342
Total sedentary time d −0.037 −0.064 0.414 −0.032 −0.044 0.583
Model 3: Model 2 + MVPAe
TV viewing c −0.016 −0.026 0.734 0.045 0.061 0.429
Use of computer games c 0.010 0.018 0.819 −0.085 −0.115 0.144
Use of console games d 0.022 0.041 0.643 0.069 0.085 0.602
Use of internet for non-study d −0.027 −0.049 0.569 −0.003 −0.005 0.957
Use of internet for study d −0.067 −0.114 0.207 0.095 0.127 0.139
Time of study c 0.009 0.015 0.843 −0.062 −0.083 0.286
Total sedentary time d −0.041 −0.071 0.364 −0.036 −0.049 0.537

Significant results are in bold.

All sedentary behaviours represent the average of the whole week (min/day).

aβ is the estimated standardized regression coefficient.

b Partial correlation.

c Square-root transformed data.

d Log-transformed data.

e Moderate to vigorous physical activity.

Gracia-Marco et al.

Gracia-Marco et al. BMC Public Health 2012 12:971   doi:10.1186/1471-2458-12-971

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