P-149 - Psychometric validation of the spanish version of the GAD-2 scale for screening generalized anxiety disorder

Abstract

Aim: To carry out the psychometric validation of the Spanish version of the 2-items self-administered GAD-2 scale for screening probable patients with Generalized Anxiety Disorder (GAD). Methods: The content validity was assessed by inter-ratter-agreement (item-goal congruence index of Rovinelli-Hambleton). The GAD-2 was self-administered to patients with GAD according to DSM IV criteria and their respective controls, matched by age and sex, who were recruited at random in Mental Health and Primary Care centres. Criteria validity was explored using ROC curve analysis, and sensitivity, specificity, predictive positive value and negative value for different cutoff values were determined. Concurrent validity was also explored using the HAM-A, HADS, and WHO-DAS-II scales. Results: The study sample consisted of 212 subjects (106 patients with GAD) with a mean age of 50.38 years (SD=16.76). No items of the scale were left blank. Floor and ceiling effects were negligible. No patients with GAD had to be assisted to fill in the questionnaire. Reliability (internal consistency) was high; Cronbach´α=0.875. A cutoff point of 3 showed adequate values of sensitivity (91.5%) and specificity (85.8%), with AUC being statistically significant [AUC=0.934; p< 0.001] to distinguish GAD patients from controls. Concurrent validity was also high and significant with HAM-A (0.806, p< 0.001), HADS (anxiety domain, 0.825, p< 0.001), and WHO-DAS II (0.642, p>0.001) scales. Conclusion: The Spanish version of the GAD-2 scale was shown to have appropriate psychometric properties to promptly detect probable cases of GAD in the Spanish cultural context under conditions of routine clinical practice.

Reliability, Validity, and Measurement Invariance of the General Anxiety Disorder Scale Among Chinese Medical University Students

“…Although the one-dimensional structure of the GAD-7 proposed by its developer is not consistent across all studies, the construct validity of its unidimensional structure was confirmed in the current study. This finding was consistent with the majority of published studies conducted in both the primary care setting and the general population (9,25,63). Nevertheless, a two-factor structure was reported by Satomi (40) among Japanese adult populations, as well as Kertz's (12) study in an acute psychiatric sample.…”

“…In the current study, we implemented standardized backtranslation and cross-cultural adaptation procedures to ensure the content validity of the Chinese GAD-7 version (36). The GAD-7 had a good internal consistency reliability coefficient of 0.93, which is consistent with that reported in previous studies ranging from 0.74 (42) to 0.94 (25). The strong correlation coefficient between the GAD-7 and PHQ-9 (r = 0.78) has also been observed among other samples (12,13,62).…”

“…The 7-item Generalized Anxiety Disorder Scale (GAD-7) (9), recommended by the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) (22), is a common instrument used in the screening of generalized anxiety disorders because of its simplicity and operability. The GAD-7 has been translated into different languages, including Chinese, over the last two decades (23)(24)(25)(26). The reliability, validity, and diagnostic capability of the GAD-7 have been confirmed, but the majority of previous psychometric studies focused on clinical settings rather than general populations (12,23,(27)(28)(29).…”

Depression, Post-traumatic Stress, Anxiety, and Fear of COVID-19 in the General Population and Health-Care Workers: Prevalence, Relationship, and Explicative Model in Peru

“…A cohort point of 10 or more is considered to correspond to moderate anxious symptoms [26]. The scale has been previously translated into Spanish and validated [27]. It consists of seven items designed to measure the symptomatology of anxiety during the 2 weeks prior to self-application.…”

A Web-Based App for Emotional Management During the COVID-19 Pandemic: Platform Development and Retrospective Analysis of its Use Throughout Two Waves of the Outbreak in Spain

“…The GAD-7 was developed for its use in primary care, and it has high sensitivity in identifying symptoms of the anxiety spectrum. The Spanish validation of the questionnaire has shown good reliability and validity [ 20 ]. To facilitate self-assessment, the 2 questionnaires were merged into a single questionnaire.…”