Persistence of back pain symptoms after pregnancy and bone mineral density changes as measured by quantitative ultrasound--a two year longitudinal follow up study.

The correlation between the early BMD values and the 24-28 month post delivery values were highly significant and reliable (Pearson correlation coefficient 0.95, p < 0.001 with 2-tailed analysis), as was the correlation between the late pregnancy BMD values and the 24-28 month post delivery value (Pearson correlation coefficient 0.97, p < 0.001 with 2 -tailed analysis).

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