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To establish reference values for bone mineral density (BMD), a population survey was carried out in a fishing community in Wakayama Prefecture. The BMD measurements of the lumbar spine (L2-L4) and proximal femur (femoral neck, trochanter and Ward's triangle area) were performed by sex and age, using dual-energy X-ray absorptiometry. Four hundred subjects, aged 40 to 79 years, were recruited randomly to give 50 persons in each of eight age-sex strata from a list of 2,261 residents (1,028 men and 1,233 women) living in a fishing village. The validity of sampling methods was assessed using a questionnaire about lifestyle factors, which was used for all residents aged from 40 to 79 years in the baseline survey. There were no significant differences between the subjects for BMD measurements and all the residents of the community in the frequencies of past history of diseases, healthy habits, food intakes, and rates of smoking, alcohol drinking, coffee and green tea consumption. These findings suggested that the present study population could be considered representative of samples obtained from the entire population in the fishing community. The results of BMD measurements in these subjects, who were selected at random, showed that except for a slightly high BMD of the lumbar spine in men in their 60's, the mean BMD of the lumbar spine and the three proximal segments of the femur decreased with increasing age in both sexes.

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A Population Survey on Bone Mineral Density in a Fishing Village in Wakayama Prefecture. (Part 1). Distribution of Bone Mineral Density by Sex and Age Based on a Representative Sample of the Community.