Table 5 Multivariate association between sedentary behaviours and spinal BMC in women

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