Steinberg AM, Brymer MJ, Kim S, Ghosh C, Ostrowski SA, Gulley K, , Briggs, EC, Pynoos, RS (2013). Psychometric properties of the UCLA PTSD Reaction Index: Part 1, Journal of Traumatic Stress, 26, 1-9.
Steinberg, A. M., Brymer, M., Decker, K., & Pynoos, R. S. (2004). The UCLA PTSD Reaction Index. Current Psychiatry Reports, 6, 96-100. Available from: http://springer.com/medicine/psychiatry/journal/11920.
Data comes from the NCTSN Core Data Set.
1)Internal consistency reliability coefficients (Cronbach's alpha) were reported as follows:
Full Scale = .90, B = .82, C = .79, D = .67
Cronbach's alpha for the full scales across ethnic groups fell in the excellent to good range.
2) Test-retest reliability data, with an interval range from 6 to 28 days (median = 7 days), were reported for a sample of 27 adolescents, who were screened and identified as having an exposure to severe trauma. Pearson coefficients were as follows:
Full Scale = .84, Intrusion subscale = .78, Avoidance subscale = .78, and Hyperarousal subscale = .73