 In the Kuopio Osteoporosis Study OSTPRE a population based sample of 3200 women were selected for BMD measurement by Lunar DPX in 1995-1997. In all 167 women aged 612.7 years 114.9 years postmenopausal, and the T-score -2.5 SD at either the lumbar spine or femoral neck were recruited for this sub-study. 