Childhood Sexual Abuse Scale

Abstract

The Childhood Sexual Abuse Scale (CSAS) is a concise, four-item self-report instrument developed by Aalsma, Zimet, Fortenberry, Blythe, and Orr (2002) to measure the occurrence of childhood sexual abuse (CSA) in adolescent and adult populations. Designed for efficiency, the CSAS offers a significant advantage over lengthy clinical interviews or potentially unreliable single-item measures, allowing for broad utilization in various research settings, particularly those assessing multiple areas of sexual functioning and behavior.

The scale instructs participants to refer only to events that occurred prior to the age of 12, an age cutoff established through consensus in focus groups to specifically target childhood experiences and minimize the inclusion of consensual sexual experiences. The CSAS focuses on establishing the occurrence of abuse, maintaining brevity by omitting items related to the specific nature of the abuse or the participant’s relationship with the perpetrator. Crucially, its multiple-item format permits the reliable assessment of internal reliability.

Keywords

Childhood Sexual Abuse, CSAS, Self-report instrument, Trauma assessment, Adolescent psychology, Sexual health, Internal reliability, Construct validity.

Authors

Matthew C. Aalsma, J. Dennis Fortenberry, Gregory D. Zimet, Mark J. Blythe, David P. Orr.

Purpose

The primary purpose of the Childhood Sexual Abuse Scale (CSAS) is to provide a rapid and psychometrically sound method for assessing the history of childhood sexual abuse in large-scale studies involving adolescent and young adult participants. Prior to its development, researchers often had to choose between brief, single-item measures lacking reliability assessment capabilities, or comprehensive, time-consuming inventories.

The four-item structure of the CSAS addresses this gap by offering a measure brief enough to be easily incorporated into complex study protocols, yet robust enough to allow for the calculation of essential psychometric properties. This efficiency and focus on internal reliability make the CSAS a valuable screening tool for researchers investigating the correlation between CSA and subsequent health outcomes or behaviors.

Construct

The CSAS measures the unidimensional construct of the occurrence of childhood sexual abuse (CSA). This construct is operationalized by specific experiences of unwanted sexual contact, sexual coercion, or the participant’s belief in having been sexually abused, provided these events took place before the age of 12. The items are designed to capture coercive and non-consensual sexual activity.

The scale’s focus is on the binary presence or absence of these traumatic experiences during childhood. Although the scale does not delve into contextual details—such as whether penetration occurred or the identity of the perpetrator—it effectively captures the essence of non-consensual sexual victimization during the defined developmental period, where consensual sexual experiences are less likely to occur.

Validity

The validity of the CSAS is supported by established content, face, and construct validity evidence. Content validity was established by comparing the items against other existing childhood sexual abuse measures, leading to the conclusion that the CSAS exhibits strong face validity.

Support for construct validity comes from the scale’s empirical relationship with other established measures of pathology and risky behavior. In the initial validation study, individuals categorized as reporters (either consistent or inconsistent) of CSA based on the CSAS exhibited marked increases in measures of pathology, such as depression, and health-compromising behaviors, including sexual coercion and greater lifetime numbers of sexual partners. Furthermore, consistent reporters showed a linear trend, reporting the highest rates of depression and lifetime sexual partners.

The utility of the scale over single-item measures was reinforced by a logistic regression analysis, which demonstrated that adolescents endorsing at least two items on the CSAS were over five times more likely to be consistent CSA reporters. Additional research utilizing the CSAS with homeless youth also found significant differences, showing that gay and lesbian youth were more likely to report sexual abuse as a reason for leaving home compared to heterosexual and bisexual youth.

Reliability

The CSAS demonstrates excellent internal reliability, confirming that the four items consistently measure the intended single construct. The scale was initially validated using a sample of female adolescents and young adults (ages 14 to 24) recruited from urban health clinics, including a sexually transmitted disease clinic.

Internal consistency, measured by Cronbach’s Alpha ($alpha$), was strong both at the initial assessment and during follow-up. The baseline assessment yielded an Alpha coefficient of 0.81. This reliability remained stable and high during a seven-month follow-up period, where the Alpha increased slightly to 0.84 (Aalsma et al., 2002). These high coefficients demonstrate the CSAS’s dependability as a measure of CSA experiences.

Factor Analysis

The developers of the CSAS intended for the instrument to measure a single, overarching construct: the occurrence of childhood sexual abuse. While explicit factor analysis results (such as factor loadings or variance explained) are not detailed in the available source content, the reported high Cronbach’s Alpha values (0.81–0.84) strongly support the conclusion that the scale is unidimensional. These high internal consistency scores indicate that the four items share a substantial common variance, confirming the successful measurement of a single, coherent psychological construct.

Instrument

Test Type: Self-report instrument (Brief Screening Scale)

Format: Brief written questionnaire consisting of 4 items.

Language Available: English (Validated in the United States).

Population Group: Clinical and General adolescent and adult populations.

Age Group: 14 years and older.

Population Details: Originally validated on female adolescent and young adult subjects (14 to 24 years of age) recruited from high-risk settings, including urban health clinics and sexually transmitted disease clinics in the Midwestern United States. It has also been applied successfully to samples of homeless youth.

Test Methodology: Participants respond to each item by circling “Yes” or “No.” The total score is calculated by summing the positive responses, resulting in a score range of 0 to 4.

Keywords

CSA detection, Adolescent mental health, Depression correlation, Sexual coercion, Logistic regression, Psychometric properties, Unidimensional scale, Brief assessment.

Authors

Author ORCID Identifier: Not provided in source content.

Affiliation Email addresses: Not provided in source content.

Correspondence Address: Matthew C. Aalsma and J. Dennis Fortenberry, Indiana University School of Medicine, Indianapolis (Affiliation listed in source material).

Permissions & Fee and Test Year

Permissions and Fees: Specific information regarding usage permissions and associated fees is not provided in the source material. Potential users should contact the corresponding authors, Matthew C. Aalsma or J. Dennis Fortenberry, for authorization regarding scale usage and licensing requirements.

Test Year: 2002 (Year of initial publication and validation of the scale).

Reference’s

• Aalsma, M. C., Zimet, G. D., Fortenberry, J. D., Blythe, M. J., & Orr, D.P. (2002). Report of childhood sexual abuse by adolescents and young adults: Stability over time. The Journal of Sex Research, 39, 259–263.
• Fortenberry, J. D. & Aalsma, M. C. (2003). Abusive sexual experiences before age 12 and adolescent sexual behaviors. In J. Bancroft (Ed.), Sexual Development in Childhood (pp. 359–369). Bloomington, IN: Indiana University Press.
• Rew, L., Whittaker, T. A., Taylor-Seehafer, M. A., & Smith, L. R. (2005). Sexual health risks and protective resources and gay, lesbian, bisexual, and heterosexual homeless youth. Journal for Specialists in Pediatric Nursing, 10, 11–19.

Items of the Childhood Sexual Abuse Scale

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

Instructions: These next questions are about activity before you were 12 years old.

1. Someone tried to touch me in a sexual way against my will.

2. Someone tried to make me touch them in a sexual way against my will.

3. I believe that I have been sexually abused by someone.

4. Someone threatened to tell lies about me or hurt me unless I did something sexual with them.