Low self-efficacy has been identified as one of the factors that could hinder the prescribing competence of nurses. No valid and reliable existing instruments assess Galician nurses' confidence to prescribe. The aim of this study was to determine the reliability and validity of the Galician version of the Nurse Prescribing Self-Efficacy Scale (G-NP-SES, 19 items). The study was conducted in two phases: the translation and adaptation to the Galician version of the NP-SES, and the assessment of its psychometric properties. G-NP-SES was sent to nurses working in primary healthcare centers in Galicia (Spain) between March and June of 2022. Its content, construct and discriminant validity, and internal consistency reliability were examined. A total of 193 people participated in the study. As the original scale, G-NP-SES also had three dimensions (% of cumulative variance = 80.82%). It showed good internal consistency (Cronbach's alpha coefficient (α) = 0.90, with each factor ranging from 0.86 to 0.89), high content validity (scale's content validity index = 0.92, with item-content validity index ranged from 0.87 to 1), and good discriminant validity. G-NP-SES is an instrument with good psychometric properties which could be used to accurately assess Galician nurses' self-efficacy to prescribe and consequently to improve their job performance.
Keywords: nurse prescribing; psychometric properties; reliability; self-efficacy; validity.