Table 3.

Associations of TBS and prevalent radiographic vertebral fracture with incident hip fractures, and model discrimination compared to base model^*†

Predictor	Model 1 (n=5862)	Model 2 (n=5829)	Model 3 (n=5829)
TBS (per sd decrease)	1.24 (1.08 to 1.49)		1.20 (1.05 to 1.39)
Prevalent Radiographic Vertebral Fracture		2.02 (1.38 to 2.96)	1.86 (1.26 to 2.74)
Harrell’s C (95% C.I.)	0.79 (0.76 to 0.82)	0.79 (0.76 to 0.82)	0.79‡ (0.76 to 0.82)

^*Base model (with log of FRAX with BMD 10 year hip fracture risk estimate as sole covariate; Harrell’s C for base model is 0.79 (95% C.I. 0.76 to 0.92).

^†Model 1 covariates: log of FRAX with BMD plus TBS; Model 2 covariates; log of FRAX with BMD plus prevalent radiographic vertebral fracture; Model 3 covariates; log of FRAX with BMD plus TBS and prevalent radiographic vertebral fracture

^‡p-value >0.5 compared to base model