例如，如果按家庭富裕程度观察五岁以下死亡率，就可见到国家内部社会经济水平与健康之间的关系是分等级的。

For example, if you look at under-5 mortality rates by levels of household wealth you see that within counties the relation between socioeconomic level and health is graded.

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例如，如果按家庭富裕程度观察五岁以下死亡率，就可见到国家内部社会经济水平与健康之间的关系是分等级的。

For example, if you look at under-5 mortality rates by levels of household wealth you see that within counties the relation between socioeconomic level and health is graded.

youdao