The univariate prevalence ratios (PR) for low bone mineral density at baseline for at least one DXA scan site (forearm, spine, hip) estimated by z-scores less than −2.0, with 95% confidence intervals (CI) and p-values, by demographic characteristics, risk factors and laboratory parameters (N = 220)

aThere are 4 subjects who were married, and none had a low BMD. bThere were 2 with no hormonal method, and neither had low BMD. cPrevalence ratios for laboratory values refer to a one unit change in that parameter.