New Study Validates the Sexual Dependency Inventory as a Research Tool

Study Confirms Reliability of Key Assessment Tool for Sexual Addiction

Accurate measurement is the foundation of good research. Before scientists can study the causes, patterns, or treatment of any condition, they need tools that reliably capture what that condition looks like. A study published in Sexual Addiction and Compulsivity provides exactly that kind of foundation for the field, confirming the structure of one of the most widely used assessment tools for problematic sexual behavior.

The study, conducted by Bradley A. Green, Randolph C. Arnau, Patrick Carnes, Stefanie Carnes, and Tiffany A. Hopkins, examined the Sexual Dependency Inventory, 4th Edition, known in the field as the SDI. The SDI is a broadband, multidimensional measure designed to assess problematic sexual behaviors and preoccupations associated with sexual addiction and related sexual disorders, including the paraphilias.

Why Replicability Matters

Any assessment tool used in clinical or research settings needs to hold up across different groups of people, not just the sample it was originally built on. The internal structure of the SDI had previously been evaluated using a sexual addiction clinical sample of 626 men and 85 women, but researchers had not yet tested whether that structure would replicate in a separate sample.

This gap mattered. A tool that only works well for the specific group it was designed around has limited value for the broader field. Researchers and clinicians need confidence that the categories and patterns identified by the SDI reflect something real and consistent, not a statistical artifact of one particular dataset.

A Large-Scale Test

To close that gap, the research team took an ambitious approach. The study examined the internal structure of SDI responses in a very large clinical sample of more than 1,000 individuals, and then tested whether that same structure held up in a second sample of similar size. Using two large, independent samples rather than one allowed the researchers to directly test whether their findings could be trusted beyond the group they were first observed in.

This kind of replication design is considered a gold standard in psychometric research. Finding the same underlying structure twice, in two separate large samples, provides far stronger evidence than a single analysis ever could.

What the Findings Mean for the Field

Beyond confirming replicability, the broader purpose of the research was to examine the psychometric properties of the SDI, refine the instrument based on the findings, and make recommendations for a revised version of the tool. In other words, this was not only a validation study. It was also an effort to sharpen and improve the instrument itself, ensuring it continues to serve clinicians and researchers well as the field advances.

Reliable measurement tools like the SDI make it possible to compare findings across studies, track patterns across different populations, and build the kind of consistent evidence base that leads to better understanding and better treatment. Work like this may not carry the same public attention as a clinical trial or a genetic study, but it is foundational. Every large-scale investigation into sexual addiction, including the genetic research AFAR is currently supporting, depends on having assessment tools that have been rigorously tested and proven trustworthy.

Supporting the Science Behind the Science

AFAR is committed to advancing research that strengthens the evidence base for understanding and treating sexual addiction, from foundational psychometric work like this study to large-scale genetic investigations underway today. Studies like this one make future research possible by ensuring that what gets measured is measured well.

If you would like to support AFAR's continued investment in rigorous, evidence-based research into sexual addiction, consider making a donation today.

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Source: Green, B. A., Arnau, R. C., Carnes, P., Carnes, S., & Hopkins, T. A. (2015). Structural Congruence of the Sexual Dependency Inventory: 4th Edition. Sexual Addiction & Compulsivity, 22(2), 126-153.