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Table 4 Association of low V LF and osteoporotic femoral neck BMD with fractures that occurred during different follow-up periods

From: Association between low-frequency ultrasound and hip fractures - comparison with DXA-based BMD

  Fx 1997-2006 Fx 2006-2010 Fx 1997-2010
NF n = 409, Fx n = 81 NF n = 429, Fx n = 61 NF n = 334, Fx n = 121*
  n OR (95% CI) p HR (95% CI) p OR (95% CI) p
VLF Moderate or high (25-100%) 364       
Low (0-25%) 126 1.6 (0.9 - 2.6) 0.088 0.8 (0.4 - 1.4) 0.359 1.3 (0.8 - 2.0) 0.326
Femoral neck BMD T-score > -2.5 355       
  T-score ≤ -2.5 135 1.8 (1.1 - 3.0) 0.019 2.4 (1.4 - 3.9) 0.001 2.5 (1.6 - 3.9) <0.001
  1. All regression models were adjusted by age and BMI. In Cox regression previous fracture (during 1997–2006) was also used as a covariate. NF = non-fractured group, Fx = fractured group, n = number of subjects, OR = odds ratio of logistic regression, HR = hazard ratio of Cox regression, CI = confidence interval, p = p-value of the covariate in the model. *Subjects who died during the follow-up were excluded (NF n = 26, Fx n = 9).