Table 4 Multivariate association between sedentary behaviours and spinal BMC in men

Model 1

0.701

Model adjusted for Age (β = 0.771)^***, BMI (β = 0.153)^***, Ethnicity (β = 0.094)^*** and Vitamin D (β = 0.093)^***

Objective sedentary time

0.001

5.33 (−3.11 to 13.78)

0.031

Time spent watching TV

0.001

−0.47 (−1.06 to 0.12)

−0.036

Time spent on computer

0.001

−0.51 (−1.32 to 0.31)

−0.028

Total screen time

0.001

−1.17 (−2.60 to 0.25)

−0.037

Total non-screen SB

0.000

0.07 (−0.07 to 0.20)

0.021

α

0.002

−3.16 (−7.47 to 1.15)

−0.034

Model 2

0.708

Model 1 adjusted for objectively measured MVPA (β = 0.097)^**

Objective sedentary time

0.009 ^***

24.10 (13.22 to 34.99) ^***

0.139

Time spent watching TV

0.001

− 0.48 (−1.06 to 0.10) ^*

−0.036

Time spent on computer

0.001

−0.45(−1.26 to 0.37)

−0.024

Total screen time

0.001

−1.08(−2.50 to 0.34)

−0.034

Total non-screen SB

0.001

0.04(−0.04 to 0.232)^**

0.031

α

0.005 ^**

−8.23 (−13.06 to −3.39) ^***

−0.090

Model 3

0.482

Model 1 adjusted for weekly frequency of strengthening exercise (β = 0.099)^**

Objective sedentary time

0.001

5.51 (−5.25 to 16.27)

0.036

Time spent watching TV

0.004

- 0.69 (−1.44 to 0.07)

−0.063

Time spent on computer

0.002

−0.84 (−2.06 to 0.39)

−0.047

Total screen time

0.004

−1.86 (−3.83 to 0.11)

−0.066

Total non-screen SB

0.004 ^*

0.36 (0.00 to 0.72) ^*

0.067

α

0.002

−3.32(−8.99 to 2.36)

−0.040

Model 4

0.378

Model 1 adjusted for weekly frequency of vigorous playing or exercise (β = 0.048)

Objective sedentary time

0.000

−0.799 (−8.79 to 7.19)

−0.013

Time spent watching TV

0.005

0.276 (−0.21 to 0.76)

0.073

Time spent on computer

0.000

−0.06 (−0.55 to 0.43)

−0.016

Total screen time

0.001

0.27 (−0.46 to 0.99)

0.028

Total non-screen time SB

0.000

−0.01 (−0.05 to 0.07)

0.018

α

0.001

−0.78 (−4.39 to 2.84)

−0.028