Validation of the Amsterdam Preoperative Anxiety and Information Need Scale in Adults, Chile 2019

Abstract

Introduction: A study evidences the advantage of obtaining a validated instrument that allows assessing patients’ preoperative anxiety and information levels and responds to care management, with effective assessments and relevant care.

Objective: To validate the Amsterdam preoperative anxiety scale and the information need of adult patients who received surgery.

Methods: An instrumental study of psychometric analysis was conducted at a Chilean private clinic in 2019. The population included 1200 patients admitted for surgery. The sample size was calculated according to the number of patients operated on in the previous year; 50 % of the population was considered a significant sample. The study consisted of four stages: 1) translation, back translation and linguistic adaptation; 2) content validation; 3) construct validation, using Kaiser–Meyer–Olkin’s (KMO) tests of coefficient, Bartlett's test of sphericity, as well as exploratory and confirmatory factor analysis; and 4) reliability with two-half test (r Spearman-Brown) and Cronbach's alpha.

Results: The KMO coefficient was 0.72 and Barlett's test yielded a p value of 00. Exploratory factor analysis was carried out using correlation of variables, rejecting the null hypothesis. The single-factor model permitted to obtain a chi-square test value of 9032, a p-value of 0.13, a root mean square residual of 0.063, a root mean square error of approximation of 0.041, and a complement factor I of 0.98. Spearman-Brown r reliability was 0.91 and for Cronbach's alpha it was 0.95. In the r-Pearson test, correlations higher than 0.62 were obtained.

Conclusion: The adapted Spanish version of the Amsterdam preoperative anxiety and information scale confirms the original psychometric properties of the scale, making it valid and reliable for application in the target population.