KMID : 0806120070370030414
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´ëÇÑ°£È£ÇÐȸÁö 2007 Volume.37 No. 3 p.414 ~ p.421
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The Use of Propensity Score Matching for Evaluation of the Effects of Nursing Interventions
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Lee Suk-Jeong
Yoo Ji-Soo Shin Mi-Kyung Park Chang-Gi Lee Hyun-Chul Choi Eun-Jin
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Abstract
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Background:Nursing intervention studies often suffer from a selection bias introduced by failure of random assignment. Evaluation with selection bias could under or over-estimate any intervention¡¯¡¯s effects. PS matching (PSM) can reduce a selection bias through matching similar Propensity Scores (PS). PS is defined as the conditional probability of being treated given the individual¡¯¡¯s covariates and it can be reused to balance the covariates of two groups.
Purpose:This study was done to assess the significance of PSM as an alternative evaluation method of nursing interventions. Method: An intervention study for patients with some baseline individual characteristic differences between two groups was used for this demonstration. The result of a t-test with PSM was compared with a t-test without matching.
Results:The level of HbA1c at 12 months after baseline was different between the two groups in terms of matching or not.
Conclusions:This study demonstrated the effects of a quasi-random assignment. Evaluation using PSM can reduce a selection bias impact that affects the result of the nursing intervention. Analyzing nursing research more objectively to reduce selection bias using PSM is needed.
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KEYWORD
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Propensity score matching, Nursing intervention, Evaluation
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