Endogenous factors affecting bone mineral content in post-menopausal women.

Eighty-eight healthy post-menopausal women were divided into two groups, one of 35 subjects who had undergone menopause up to 9 years previously and the second of 53 subjects who were 10 or more years post-menopausal. In each individual we related the bone mineral content (BMC), measured by single photon absorptiometry in the distal forearm, to anthropometric variables and urinary oestrogen excretion. There was a positive association between BMC and both urinary oestrogen excretion and anthropometric variables, but this was statistically significant only in the older women. As expected, BMC in the distal forearm decreased with advancing age, the fall being greatest in the first 9 years after the menopause. We concluded that although a single measurement of urinary oestrogen and anthropometric variables does not provide enough information to predict an individual's BMC, the values obtained may prove of use, along with a single BMC determination, in helping to predict the rate of bone loss.