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Table 2 Results of multiple regression models for the predictor variable 'group' expressed for each DXA dependent variable, adjusted for age, height and mass

From: Chronic low back pain is associated with reduced vertebral bone mineral measures in community-dwelling adults

 

Males

Females

DXA variable

B co-efficient (group)

95% CI

p

R2

B co-efficient

(group)

95% CI

p

R2

PA L3 BMC (g)

-0.78

-3.24, 1.68

0.52

0.11

-0.90

-2.77, 0.96

0.33

0.35#

PA L3 aBMD (g/cm2)

-0.02

-0.12, 0.09

0.74

0.06

-0.02

-0.12, 0.08

0.73

0.21

PA total spine BMC (g)

-2.89

-11.97, 6.20

0.52

0.14

-0.44

-7.61, 6.73

0.90

0.37#

PA total spine aBMD (g/cm2)

-0.03

-0.13, 0.07

0.55

0.10

-0.02

-0.11, 0.07

0.71

0.26#

Lateral L3 BMC (g)

-0.71

-1.86, 0.45

0.22

0.47#

0.24

-0.81, 1.29

0.64

0.25#

Lateral L3 aBMD (g/cm2)

-0.09

-1.65, -0.01

0.03

0.55#

0.01^

-0.06, 0.08

0.78^

0.21^

Lateral L3 ap.vBMD (g/cm3)

-0.02

-0.04, -0.001

0.04

0.53#

0.01^

-0.01, 0.02

0.40^

0.16^

  1. # multivariate model significant (p < 0.05)
  2. ^adjusted for physical activity also
  3. PA postero-anterior
  4. BMC bone mineral content
  5. aBMD areal bone mineral density
  6. ap.vBMD apparent volumetric bone mineral density
  7. Separate models were run for males (n = 28) and females (n = 43). The unstandardized regression co-efficient (B) represents the mean difference in the DXA variable between the groups, adjusted for the known covariates of age, height and mass with the associated 95% confidence interval (CI) and level of significance (p). A negative B value represents a lower DXA parameter in the CLBP group. The R2 represents the proportion of variance in the DXA variables accounted for by all the predictor variables in the model