Construct validity of the Dissociative Experiences Scale (DES): I. The relationship between the DES and other self-report measures of DES

p. 185-188The present study attempted to expand the construct validity of the Dissociative Experiences Scale (DES) by comparing it to: (a) other self-report measures of dissociation (e.g., the Tellegen Absorption Scale [TAS] and the Perceptual Alteration Scale [PAS]); (b) the construct of "ambiguity intolerance" (assessed by the Yellen Ambiguity Intolerance Scale [YAIS]); and (c) the Jenkins Activity Schedule (JAS: which measures the degree of Type A behavior). Three hundred and eleven undergraduates participated in an experiment on "Hypnotizability and Personality, " and filled out the DES TAS, PAS, YAIS, and JAS. The DES total score (and three DES factor scores) correlated with the TAS and PAS in the range of .24 - .52 (all correlations were significant at the .001 level, two-tailed). Furthermore, the DES total score (and the three DES factor scores) correlated significantly with the YAIS overall score (r's ranged from .22 - .24, all p's < .001), but did not correlate significantly with the JAS (r's ranged from -.03 - .04, ns). The findings suggest that DES scores (i.e., total scores and each of the three DES factor scores) show good levels of convergent validity as they correlate significantly with other self-report measures of dissociation. However, the intercorrelations were not high enough to consider the different dissociation measures as interchangeable. Furthermore, subjects reporting high levels of dissociative experiences also reported higher levels of ambiguity intolerance. However, no significant association was observed between DES scores and the Type A behavior pattern

Exploring the distinction between dissociation and repression.

Exploring the distinction between dissociation and repression

The dissociative experiences scale: further replication and validation

p. 151-153The purpose of the present study was to provide further evidence in support of the validity of the Dissociative Experiences Scale (DES) as a reliable measure of dissociative psychopathology. The DES was administered to 259 college students, 33 patients with multiple personality disorder (MPD), and 29 patients with a dissociative disorder not otherwise specified (DDNOS). The inter-rater reliability for the DES scoring procedure was excellent (coefficient of absolute agreement=.96; coefficient of relative agreement =.99). The test retest reliability of DES scores (within approximately one month) was also excellent (coefficient of absolute agreement =.93; coefficient of relative agreement=.96) and suggests that DES total scores are temporally stable and similar in absolute value across testings. Finally, the internal consistency of DES scores was also very high (alpha for students=.93; alpha for MPD patients =.94; alpha for DDNOS patients=.94; alpha for the combined total sample=.95). Both MPD (mean DES score =55.0) and DDNOS patients (mean DES score =40.8) earned significantly higher DES scores than students (mean DES score=23.8). In addition, MPD patients earned significantly higher DES scores than DDNOS patients. The results of the present study also suggest that a DES cutoff score of 45 to 55 maximizes the probability of correctly classifying students from dissociative disorder patients (87%) while minimizing the rates of false positive (2 to 6 %) and false negative errors (7 to 11%). Suggestions for further validation research are also made