Table 5.
Multivariate association between sedentary behaviours and spinal BMC in women
| Model |
Model R
2
adj
|
B (95% CI) | β a |
|---|---|---|---|
| R 2 change | |||
|
Model 1 |
0.643 |
|
|
| Model adjusted for age (β = 0.692)***, BMI (β = 0.197)*** and Ethnicity (β = 0.081)** | |||
| Objective sedentary time |
0.007
***
|
14.13 (6.31 to 21.96)
***
|
0.096
***
|
| Time spent watching TV |
0.003
*
|
−0.49 (−0.95 to 0.02)
*
|
−0.049
*
|
| Time spent on computer |
0.001 |
−0.53 (−1.29 to 0.29) |
−0.032 |
| Total screen time |
0.005
**
|
−0.40(−0.66 to -0.15)
**
|
−0.073
**
|
| Total non-screen SB |
0.010
***
|
0.49(0.27 to 0.71)
***
|
0.102
***
|
| α |
0.006
**
|
−6.74 (−10.62 to -2.86)
**
|
−0.087
**
|
|
Model 2 |
0.702 |
|
|
| Model 1 adjusted for objectively measured MVPA (β = 0.057) | |||
| Objective sedentary time |
0.008
***
|
23.63 (12.91 to 34.35)
***
|
0.137
***
|
| Time spent watching TV |
0.001
*
|
- 0.58 (−1.13 to -0.03)
*
|
−0.044
*
|
| Time spent on computer |
0.001 |
−0.61(−1.40 to 0.176) |
−0.033 |
| Total screen time |
0.001 |
−0.08(−0.22 to 0.06) |
−0.023 |
| Total non-screen SB |
0.013
***
|
0.58(0.35 to 0.805)
***
|
0.121
***
|
| α |
0.013
***
|
−11.24(−15.69 to -6.79)
***
|
−0.146
***
|
|
Model 3 |
0.276 |
|
|
| Model 1 adjusted for weekly frequency of strengthening exercise (β = 0.168)*** | |||
| Objective sedentary time |
0.000 |
0.86 (−9.59 to 11.31) |
0.007 |
| Time spent watching TV |
0.005 |
−0.46(−1.00 to 0.09) |
−0.069 |
| Time spent on computer |
0.001 |
−0.30 (−1.26 to 0.65) |
−0.026 |
| Total screen time |
0.007
*
|
−0.34 (−0.65 to -0.03)
*
|
−0.089
*
|
| Total non-screen SB |
0.006 |
0.27 (−0.01 to 0.54) |
0.080 |
| α |
0.000 |
0.03(−5.39 to 5.45) |
0.000 |
|
Model 4 |
0.470 |
|
|
| Model 1 adjusted for weekly frequency of vigorous playing or exercise (β = 0.101)* | |||
| Objective sedentary time |
0.000 |
0.804 (−8.68 to 10.26) |
0.009 |
| Time spent watching TV |
0.001 |
0.181 (−0.48 to 0.838) |
0.030 |
| Time spent on computer |
0.001 |
−0.20 (−1.08 to 0.67) |
−0.023 |
| Total screen time |
0.001 |
−0.08 (−0.39 to 0.24) |
−0.066 |
| Total non-screen time SB |
0.001 |
0.08 (−0.21 to 0.37) |
0.028 |
| α | 0.000 | −0.72 (−4.95 to 3.51) | −0.028 |
aStandardised regression coefficients.
*Statistically significant predictor of BMC (p <0.05).
**Statistically significant predictor of BMC (p <0.01).
***Statistically significant predictor of BMC (p <0.001).
Bold text highlights statistically significant associations.