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  THE Efficacy of an instrument designed for Specific Self – afficacy measurment in patients with MI     Zand S [1] *, Rafiei M [2]     Received: 9 Apr , 2013 Accepted: 15 Jun , 2013   Abstract   Background & Aims : F or efficient evaluation of their beliefs in patients with heart failure, there is a need to use a tool with scientific principles of psychometrics. In our country because of the absence or lack of such tools, a lot of information about efficacy beliefs in such patients is unknown. The present study aimed to design a specific self – efficacy tool for patients with heart failure.   Materials & Methods : The study methodology is a combined study. After studying the sources and interviews with experts and patients with heart failure, bank of questions and later the questionnaire was developed, and it was assessed for its validity. To analyze the data, factor analysis and descriptive statistics as well as analytical software and SPSS 15 were used.   Results: Exploratory factor analysis revealed six factors with 92 / 87% decisive of the total variance. Kaiser-Meyer-Olkin Measure (KMO) showed 915 / 0 with a value of 0 / 001. Cronbach's alpha coefficient result was 45/96 to 95/98 for the factors, and 19/99 for the whole instrument.   Conclusion: According to the results of this study, a scaled measuring instrument with 60 phrases with five scales can measure self – efficacy in patients with myocardial infarction.   Key words: Self-efficacy, MI, patient, hospital     Address: Faculty of Nursing and Midwifery, Arak University of Medical Sciences, Sardasht, IR Iran.   Tel: (+98) 0861-4173524   Email: slmnzand@arakmu.ac.ir   [1] Instructor Department of nursing , Faculty of Nursing & Midwif , Arak university of Medical Sciences, Arak,Iran . (Corresponding Author)   [2] Gynecoogist , Associate Prefessor, Faculty medical , Arak university of Medical Sciences, Arak,Iran.

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