Age, years | Lumbar BMD | Weight, kg | Exercise (yes) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Dependent variable | Model R^{2} | R^{2} increment | β | r | R^{2} increment | β | ^{r†} | R^{2} increment | β | ^{r†} | R^{2} increment | β | ^{r†} |

Disc height | 0.154 | 0.130 | 0.386^{***} | 0.365^{***} | 0.030 | 0.196^{***} | 0.240^{***} | 0.005 | 0.075^{*} | 0.132^{***} | 0.006 | 0.075^{*} | 0.083^{*} |

Disc signal | 0.303 | 0.262 | 0.549^{***} | 0.552^{***} | 0.004 | 0.072^{*} | 0.164^{***} | 0.017 | 0.142^{***} | 0.193^{***} | 0.001 | 0.024 | 0.039 |

Disc bulge | 0.109 | 0.106 | 0.348^{***} | 0.337^{***} | 0.016 | 0.146^{***} | 0.155^{***} | 0.001 | 0.029 | 0.094^{**} | 0.002 | 0.044 | 0.058 |

Anterior osteophytes | 0.111 | 0.101 | 0.341^{***} | 0.315^{***} | 0.012 | 0.127^{**} | 0.158^{***} | 0.000 | 0.019 | 0.075^{*} | 0.011 | 0.106^{**} | 0.112^{**} |

LDD summary score | 0.285 | 0.258 | 0.544^{***} | 0.519^{***} | 0.022 | 0.168^{***} | 0.247^{***} | 0.009 | 0.100^{**} | 0.176^{***} | 0.006 | 0.075^{*} | 0.101^{**} |

Multiple p value | <0.0001 | <0.0001 | <0.0001 | <0.0001 |

R

^{2}increment was calculated as squared semipartial correlation; this reflects the drop in R^{2}of the model if a particular predictor had been excluded from the model, with the rest of predictors remaining in the model.Statistically significant terms (p<0.05, at least) are shown in bold, specifically:

↵* p value <0.05;

↵** p value <0.01;

↵*** p value <0.001.

R is the Pearson correlation between raw LDD traits and age;

↵r† is the Pearson correlation between the variables adjusted for age only.

BMD, body mineral density; LDD, lumbar degenerative disc disease.