跨地区的量化证据同样支持这一趋势。2020年发表于《美国医学会杂志·儿科学》（JAMA Pediatrics）的一项系统综述与Meta分析整合1977年至2013年多国研究数据，显示女孩乳房发育起始年龄呈持续提前趋势，平均每10年提前约0.24年（接近3个月）。
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The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.，这一点在搜狗输入法2026中也有详细论述