Deardorff suggested focusing on other links, such as the higher BMI and its association with earlier puberty.

而Deardorff则建议关注其他的关联关系，例如较高的BMI与早熟之间的联系。

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For their study, published Sept. 17 in the Journal of Adolescent Health, Deardorff and her colleagues followed 444 girls, aged 6 to 8 at the start, and their mothers.

该项研究的成果发表在9月17日的《青少年健康》杂志上(Journal of Adolescent Health)，Deardorff和她的同事追踪了444个初始年龄在6至8岁的女孩和她们的母亲。

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"In higher-income families, father absence predicted earlier puberty, but it did not in lower-income, father-absent (households)," said study leader Julianna Deardorff.

研究的主要负责人Julianna Deardorff认为，“在高收入家庭，父爱缺失往往意味着更早进入青春期，但这种想象在低收入单亲家庭并不常见。”

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High levels of immigration can also make government data unreliable, says Kevin Deardorff, of the American census office.

ECONOMIST: Censuses