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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
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