求翻译：对2009年1月至3月20例住院患者及2010年1月至3月20例住院患者分别进行基础护理质量评价，比较两组患者基础护理合格率。是什么意思？

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From January to March of 2009, 20 cases in patients and January 2010 and March respectively 20 patients hospitalized for example based quality-of-care evaluation and comparison of two groups of patients care pass rate basis.

And from January, 2010 separately carries on the foundation nursing quality appraisal to from January, 2009 to March 20 example in hospital patient to March 20 example in hospital patient, compared with two group of patient foundation nursing qualified rate.

From January 2009 to March 20 hospitalized patients and from January 2010 to March 20 hospitalized patients with basic nursing quality evaluation, respectively, compared two groups of patients with basic nursing quality.