事实上，研究中发现最慷慨的是丧偶男性群体，他们中的71%会投身慈善，而这一比例在丧偶女性中为67%，离婚或分居女性比例为56%，这两个群体比例与丧偶男性相近，慷慨度仅次于丧偶男性群体。

In fact, the most generous group in the study was male widowers, 71% of whom gave to charities. Widowed females (67%) and divorced or separated females (56%) were the next two most generous groups.

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与2002年的18%相比，该比例已有下降，并且各收入群体间的差别也在缩小。

This proportion had decreased from 18% in 2002 and differences between income groups had narrowed.

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这激起了一场争论，到底这种现象是误差，或是自然选择偏爱的结果(至少当它在群体中只占有稀少比例时)。

That has provoked a debate about whether the phenomenon is an aberration, or whether natural selection favours it, at least when it is rare in a population.

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