The analysis of psychometric properties of the Vancouver Obsessional Compulsive Inventory, Persian form (VOCI)

The purpose of this study was to investigate the psychometric properties of the VOCI in northwest of Iran With the participation of a broader non-clinical sample and Compare the results with Abedi, Izadi and Moien’s(2012) study.

The method was a descriptive-correlation and statistical population consisted of all adults with no psychiatric disorder residing in the East and West Azerbaijan province (N=3437411) which 200 people were selected through cluster sampling and 40 patients with OCD selected through purposeful sampling. VOCI and Abdel-Khalek death obsession scale (DOS) used for collecting data. Data analysis was performed using SPSS-24 software

results showed the same extraction and validation in the present sample. Significant correlation coefficients with DOS (p=0.0001, r =0.56) showed Criterion validity. Cornbrash’s alpha coefficient of validity (0/946 non- obsessional group, 0.938 obsessional group, & 0.952 the whole score) showed favorable internal consistency. In addition, the results of the two-tailed independent t-test showed a statistically significant difference between mean scores of the present sample (In both clinical and nonclinical samples) with the mean of normative sample (p<0.05, df= 278, T= 2.23 non clinical sample & p=0.02, df= 118, T= 6.53 clinical sample & p= 0.0001). Using the ROC curve, a new cut-off point (91) was proposed for this tool in northwestern Iran.

It can be concluded that VOCI has also a favorable validity and reliability in the nonclinical sample but because of cultural reasons has higher cut point in the northwest of Iran.