Objective   To learn the distribution discipline of the bone mineral density of the late pregnancy women and to provide the reference for guiding the calcium nutrition for the pregnancy women.

  Methods   A quantitative ultrasound technoogy was develooped to measure the SOS of 1 069 late pregnancy women in Zhoushan archipelago, and the health status of the bone was evaluated through T-Score. The ANOVA analysis and the correlation and regression analysis procedues were conducted to fine out the changing discipline of the bone mineral density.

  Results   391 women whose T-Score of SOS were less then-1.0, which was 36158 percent in total 1 069 late pregnancy women. The average values of SOS in age groups of 20~, 25~, 30~, 35~38 were respectively 4 079.39, 4 118.48, 4 154.05, 4 166.88(m/sec). There was a significantly statistical difference between that in the four age groups(F =23.73, P < 0.001). The best fitness model between the average value of SOS and age was Y=3 237162+264152ln(X)(r=01 91, F=77.97, P < 0.01). The best fintnes smodel between the average value of SOS and BMI was Y=-0.52X²+23183X+3 855.66(r=0.89, F=12.72, P=0.004 7).

  Conclusion   The mass of bone mineral decreased in 36.58 percent pregnancy women and that reached the criterion of osteoporosis in 1.40 percent pregnancy women. The pregnancy women lost some bone mineral during the pregnancy period. However, the bone mineral density increased prograssively from 20 to 38 years old. There is a relationship of positive correlation between the BMI and loss of bone mineral.