Validation of the Malay Version of Impact of Event Scale-Revised (IES-R) Among Flood Disaster Victims in Malaysia

Ahmad Shahril Ab Halim, Azizah Othman, Sharifah Zubaidiah Syed Jaapar, Azidah Abdul Kadir, Juwita Shaaban, Norzila Zakaria, Mohd Azhar Mohd Yasin, Azwany Yaacob, Wan Nor Arifin, Asrenee Ab Razak


Background: Exposure to extreme disaster may result in severe psychological sequels especially Post Traumatic Stress Disorder (PTSD). The Impact of Event Scale-Revised (IES-R) is the commonly used instruments to assess PTSD, however up to date there is no Malay validated version to assess impact of natural disaster. Hence, this study aims to determine the validity and reliability of the Malay Impact of Event Scale-Revised (M-IES-R) in natural disaster such as flood.

Methods: A cross-sectional study was conducted from April to June 2015. The validation process involves back to back translation, content validity and face validity followed by a pilot study before the final data collection involving 168 participants. Depression Anxiety Stress Scale-21, Malay version (DASS-21-M) was used to check for concurrent validity. Construct validity was checked by confirmatory factor analysis and composite reliability by Raykov’s rho.

Results: The final model of Malay-IES-R consists of 2 factors (psychological and behavioural) with 19 items, as compared to original version with 3 factors with 22 items. It has good model fit (CFI = 0.933, TLI = 0.923, RMSEA = 0.056, SRMR = 0.058) and composite reliability (psychological = 0.89, behavioural = 0.83). M-IES-R was positively correlated with DASS-21-M. Pearson’s correlation ranged from r=0.37 to r=0.63. The optimal cut-off point for PTSD were >14 for psychological construct (sensitivity 0.83) and >6 for behavioural construct (sensitivity 0.78).

Conclusion: The final model of two factors with 19 items of the Malay-IES-R has good psychometric properties, thus valid and reliable to measure level of posttraumatic stress symptoms in natural disaster.

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CFA; Flood; PTSD; IES-R; Validity

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