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Propensity Score Matching 방법을 이용한 간호중재 효과 평가

 The Use of Propensity Score Matching for Evaluation of the Effects of Nursing Interventions

Journal of Korean Academy of Nursing 2007년 37권 3호 p.414 ~ 421
KMID : 0806120070370030414
이숙정 ( Lee Suk-Jeong ) - 적십자간호대학

유지수 ( Yoo Ji-Soo ) - 연세대학교 간호학과
신미경 ( Shin Mi-Kyung ) - University of Illinois at Chicago Public health
박창기 ( Park Chang-Gi ) - University of Illinois at Chicago Public health
이현철 ( Lee Hyun-Chul ) - 연세대학교 의과대학 의학과
최은진 ( Choi Eun-Jin ) - 연세대학교 간호대학 정책연구소

Abstract

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.
KeyWords
경향점수, 중재 평가
Propensity score matching, Nursing intervention, Evaluation
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SCI(E) MEDLINE 학술진흥재단(KCI) KoreaMed