Table 2

Linear regression analysis for whole body 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 −0.043 −0.057 0.452 0.030 0.040 0.607
Use of computer games c 0.066 0.089 0.242 −0.039 −0.052 0.502
Use of console games d 0.001 0.001 0.988 −0.135 −0.202 0.188
Use of internet for non-study d −0.067 −0.093 0.269 0.066 0.089 0.280
Use of internet for study d −0.023 −0.029 0.745 0.097 0.132 0.119
Time of study c −0.080 −0.08 0.159 −0.129 −0.174 0.023
Total sedentary time d −0.092 −0.157 0.043 −0.087 −0.117 0.139
Model 2: Model 1 + lean mass
TV viewing c 0.010 0.022 0.772 0.003 0.005 0.947
Use of computer games c −0.008 −0.017 0.822 −0.043 −0.072 0.356
Use of console games d 0.046 0.104 0.238 −0.053 −0.101 0.518
Use of internet for non-study d −0.074 −0.167 0.047 0.058 0.097 0.241
Use of internet for study d −0.029 −0.063 0.484 0.089 0.149 0.055
Time of study c 0.016 0.033 0.663 −0.045 −0.074 0.338
Total sedentary time d −0.033 −0.074 0.343 −0.021 −0.035 0.662
Model 3: Model 2 + MVPAe
TV viewing c 0.006 0.012 0.872 0.001 0.002 0.983
Use of computer games c −0.010 −0.022 0.776 −0.044 −0.073 0.347
Use of console games d 0.043 0.099 0.265 −0.036 −0.067 0.673
Use of internet for non-study d −0.075 −0.168 0.047 0.064 0.109 0.190
Use of internet for study d −0.034 −0.073 0.421 0.085 0.140 0.071
Time of study c 0.015 0.033 0.673 −0.050 −0.081 0.296
Total sedentary time d −0.037 −0.083 0.292 −0.024 −0.040 0.613

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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