Table 3.

Threshold regression output for second fractures in the Study of Osteoporotic Fractures based on the degradation-shock model in (5).

2nd fracture	Coefficient estimate	SE	P-value
Regression for baseline log-skeletal strength ln(y0):
bmi	0.139	0.070	0.049
fnBMD	5.562	2.146	0.010
mndepth	0.881	0.326	0.007
Intercept	−3.035	1.728	0.079
Regression for degradation rate λ:
bmi	−0.024	0.013	0.057
Intercept	0.829	0.319	0.009

Note: The top section of output gives the fitted regression model for baseline log-skeletal strength ln(y₀). The bottom section gives the fitted regression function for degradation rate λ. The sample size is 519.