Table 3.
Multivariate association between sedentary behaviours and femoral BMC in women
| Model |
Model R
2
adj
|
B (95% CI) | β a |
|---|---|---|---|
| R 2 change | |||
|
Model 1 |
0.655 |
|
|
| Model adjusted for age (β = 0.377)***, age of first menstrual cycle (β = −0.236)***, BMI (β = 0.377)*** and Ethnicity (β = 0.086)*** | |||
| Objective sedentary time |
0.000 |
0.21 (−3.67 to 4.19) |
0.003 |
| Time spent watching TV |
0.003
*
|
−0.28 (−0.50 to −0.06)
*
|
−0.057 |
| Time spent on computer |
0.000 |
−0.18 (−0.54 to 0.19) |
−0.022 |
| Total screen time |
0.004
**
|
−0.80 (−1.35 to −0.25)
**
|
−0.066 |
| Total non-screen SB |
0.004
**
|
0.15 (0.04 to 0.26)
**
|
0.063 |
| α |
0.001 |
−1.41 (−3.28 to 0.47) |
−0.038 |
|
Model 2 |
0.662 |
|
|
| Model 1 adjusted for objectively measured MVPA (β = 0.130)*** | |||
| Objective sedentary time |
0.005
***
|
8.07 (3.18 to 12.97)
***
|
0.113 |
| Time spent watching TV |
0.003
*
|
- 0.26 (−0.48 to −0.05)
*
|
−0.055 |
| Time spent on computer |
0.000 |
−0.16 (−0.52 to 0.20) |
−0.020 |
| Total screen time |
0.004
**
|
−0.77 (−1.31 to −0.22)
**
|
−0.063 |
| Total non-screen SB |
0.006
**
|
0.327 (0.141 to 0.513)
**
|
0.095 |
| α |
0.007
***
|
−4.05 (−6.18 to −1.92)
***
|
−0.109 |
|
Model 3 |
0.415 |
|
|
| Model 1 adjusted for weekly frequency of strengthening exercise (β = 0.173)*** | |||
| Objective sedentary time |
0.002 |
−3.21 (−8.25 to 1.81) |
−0.049 |
| Time spent watching TV |
0.009
*
|
− 0.33 (−0.59 to −0.07)
*
|
−0.095 |
| Time spent on computer |
0.000 |
−0.10 (−0.56 to 0.35) |
−0.017 |
| Total screen time |
0.009
*
|
−0.86 (−1.54 to −0.17)
*
|
−0.095 |
| Total non-screen SB |
0.004 |
0.11 (−0.02 to 0.25) |
0.064 |
| α |
0.000 |
0.842 (−1.72 to 3.41) |
0.025 |
|
Model 4 |
0.577 |
|
|
| Model 1 adjusted for weekly frequency of vigorous playing or exercise (β = 0.140)** | |||
| Objective sedentary time |
0.003 |
−3.15 (−7.85 to 1.55) |
−0.061 |
| Time spent watching TV |
0.004 |
0.23 (−0.11 to 0.55) |
0.065 |
| Time spent on computer |
0.000 |
−0.03 (−0.47 to 0.41) |
−0.006 |
| Total screen time |
0.001 |
0.26 (−0.45 to 0.97) |
0.034 |
| Total non-screen time SB |
0.000 |
−0.08 (−0.23 to 0.07) |
−0.048 |
| α | 0.000 | −0.513(−1.59 to 2.61) | 0.022 |
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 <0.0001).
Bold text highlights statistically significant associations.