研究结果发表于《儿科学》（Pediatrics），并迅速引发关注：在20世纪90年代中期，女孩乳房发育的平均起始年龄已提前至约10岁，比此前医学文献中的记录早了一年多。而且，这一变化在不同族群中表现出明显差异——白人女孩乳房发育的平均起始年龄约为9.96岁，非裔女孩则进一步提前至8.87岁。
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