求翻译：采用分层随机抽样的方法，在青海省抽取四个县的37个村，在每个村选取当地慢性病患者居民作为健康知识知晓率调查对象进行健康知识问卷调查，样本总量合共360份。是什么意思？

Stratified random sampling method was taken in Qinghai Province, 37 villages in four counties, selected residents of the local patients with chronic diseases as health awareness rate of the survey in each village health knowledge survey, the total sample a total of 360 copies.

Using a layered approach to the random sample taken from Qinghai Province in 4 counties of the 37 villages, each village in selected patients with chronic diseases local residents know that rate as health knowledge survey for health knowledge survey, a total of 360 samples total.

Uses the lamination random sampling the method, extracts four counties in Qinghai Province 37 villages, selects the local chronic illness patient inhabitant in each village to take the healthy knowledge knows rate the investigation object to carry on the healthy knowledge questionnaire survey, the s

Using stratified random sampling method, extracts the 37 villages in four counties in Qinghai province, in patients with chronic diseases in selected local residents, as each village health knowledge rate survey questionnaire survey on health knowledge, total sample comprising 360.

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