Reliability and Factor Structure of the Sex Offender Treatment Intervention and Progress Scale

Michael H. Miner, Sébastien Brouillette-Alarie, Simon T. Davies, Nicholas P Newstrom, Beatrice “Bean” E. Robinson, David Thornton, R. Karl Hanson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Assessment of risk of sexual recidivism has progressed from tools containing only static factors to tools including dynamic (i.e., changeable) risk factors. The psychometric properties and factor structure of one such scale, the Sex Offender Treatment Intervention and Progress Scale (SOTIPS) were explored. Seven hundred and thirty-one men assigned probation for sexual crimes in New York City and Maricopa County, Arizona were administered SOTIPS three times: intake into probation, six months later, and six months after that. SOTIPS showed good internal consistency (Time 1 ω =.87, Time 2 ω =.89, and Time 3 ω =.91), and acceptable inter-rater reliability (for the 26 cases rated in the same month, ICC =.821). An exploratory factor analysis did not result in the original factor structure proposed by the developers; instead, SOTIPS showed two factors: sexual risk and antisocial opposition. This factor structure required the averaging of two items to avoid collinearity. SOTIPS showed temporal invariance indicating that its factor structure and its association to underlying latent variables are consistent over time.

Original languageEnglish (US)
Pages (from-to)83-102
Number of pages20
JournalSexual Abuse
Issue number1
StatePublished - Feb 2023

Bibliographical note

Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This project was supported by Award No. 2012-AW-BX-0153, awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice and Award No. UL1TR002494, awarded by the National Center for Advancing Translational Sciences of the National Institutes of Health. The opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect those of the Department of Justice or the National Institutes of Health's National Center for Advancing Translational Sciences. The authors take responsibility for the integrity of the data, the accuracy of the data analyses, and have made every effort to avoid inflating statistically significant results. Data are archived and available through the U.S. National Archive of Criminal Justice Data (NACJD).

Publisher Copyright:
© The Author(s) 2022.


  • dynamic risk
  • factor structure
  • measurement invariance
  • needs
  • reliability
  • sex offender treatment intervention and progress scale
  • sexual offending

PubMed: MeSH publication types

  • Journal Article


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