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55名4～5岁健康儿童分两组（A组34名，平均4.45±0．5岁；B组21名，平均4岁）进行长期口服补钙的自身交叉对比试验，结果显示两组儿童补钙前后各自的平均24h尿钙排泄量均无显著变化，未提供补钙对儿童血压影响的证据。本研究提示尿钠、钠／钾的增加对血压水平的升高有显著影响。
Fifty-five healthy children aged 4-5 years were divided into two groups (34 in group A with an average of 4.45 ± 0.5 years; group B with 21 in average, 4 years old). The results of long-term oral calcium self-comparison test showed that two groups of children There was no significant change in mean 24-hour urinary calcium excretion before and after calcium supplementation, and no evidence of the effect of calcium supplementation on blood pressure in children. This study suggests that increased urinary sodium and sodium / potassium have a significant effect on the increase of blood pressure.