Additive and multiplicative statistical models in epidemiology invoke different assumptions regarding exposure-outcome relationships. While either may seem to provide an adequate fit in small data sets, a comparative parameter based on the correct set of assumptions will be more stable…

Two issues related to osteoporosis are addressed. (1) To estimate the prevalence of osteoporosis in Canada. (2) To estimate the effect of initial bone mass on bone mineral density (BMD) decline rates over a period of three years. We employ…