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Linear regression analysis for evaluating the relationship among BMD levels, height, age, and absolute counts of lymphocyte subsets in patients with senile OP. Linear regression analysis of the relations between the right femoral neck BMD values and CD8+ T lymphocyte counts (a) or height (b) and the BMD of total lumbar and age (c) or height (d). P value < 0.05 was considered a significant linear relationship.
