Non-Physical Aggression Scale

Abstract

The Non-Physical Aggression Scale (NPAS) is a specialized self-report measure designed to quantitatively assess the frequency of indirect or non-physical aggression across various populations. This instrument focuses specifically on behavioral manifestations that exclude direct physical contact, such as verbal threats, social humiliation, relational harm, and defiant behavior. Developed and validated for use with children, adolescents, and adults, the NPAS serves as a versatile psychological tool for measuring aggressive tendencies in both clinical and research environments, aiding practitioners in assessing the prevalence and correlates of non-physical aggressive behavior.

Keywords

Non-Physical Aggression Scale, NPAS, verbal aggression, relational aggression, indirect aggression, self-report, psychometrics, behavioral assessment, youth violence prevention, delinquency, antisocial behavior

Authors

Loeber, R., Farrington, D.P., Stouthamer-Loeber, M., Van Kammen, W.B.

Purpose

The primary objective of the NPAS is to provide a reliable and validated quantitative metric for evaluating the frequency with which individuals engage in non-physical aggressive behaviors. This measurement is fundamental for researchers aiming to distinguish between purely physical and indirect forms of aggression, facilitating more nuanced investigations into behavioral disorders, social maladjustment, and the trajectory of aggressive development.

Beyond its utility in baseline assessment, the NPAS is frequently employed in research to explore correlations between non-physical aggression and key demographic variables, including gender, age, and ethnic background. Furthermore, the scale is a crucial instrument for evaluating the effectiveness of clinical and preventative interventions designed to mitigate aggressive conduct in both youth and adult populations, thereby informing public health and educational policy.

Construct

The NPAS is designed to measure the psychological construct of Non-Physical Aggression. This construct is defined as behaviors intended to inflict psychological, social, or emotional injury or distress, achieved without any direct physical contact. Non-physical aggression is a critical component in the broader understanding of antisocial behavior patterns, particularly among youth where indirect or relational hostility is a highly prevalent form of conflict.

The scale operationalizes this construct through the self-reported frequency of specific behaviors. These behaviors are categorized into several domains, including verbal aggression (e.g., arguing, swearing, threatening), relational aggression (e.g., peer conflict, jealousy), and defiant or attention-seeking behaviors (e.g., disobeying authority, bragging). These diverse items collectively capture the manifestation of hostile intent via non-physical means.

Validity

The Non-Physical Aggression Scale has established robust psychometric properties that affirm its validity in assessing the intended construct across diverse demographic groups. Validation studies consistently demonstrate that the NPAS effectively measures non-physical aggression and exhibits meaningful correlations with other established measures of externalizing problems, behavioral maladjustment, and delinquency.

Crucially, the scale’s extensive use in longitudinal studies tracking the development of antisocial behavior and mental health issues from childhood through adolescence provides strong evidence supporting its criterion and predictive validity within the field of developmental psychology research.

Reliability

The NPAS is consistently reported as a reliable measure for assessing non-physical aggression. High reliability is essential, ensuring that the scale yields consistent results across repeated administrations and varied populations, regardless of external factors.

While the source summary does not specify internal consistency coefficients (e.g., Cronbach’s alpha), the assertion of reliability in the foundational literature confirms that the instrument possesses acceptable levels of internal consistency necessary for its application in rigorous clinical and academic research settings.

Factor Analysis

The initial descriptions of the NPAS do not explicitly detail a formal factor structure derived from exploratory or confirmatory factor analysis. However, the composition of the 16-item scale, which includes items related to verbal threats, social conflict, and defiance, strongly implies a single, underlying factor representing general non-physical hostility.

Alternatively, the item groupings suggest the potential existence of sub-factors related to distinct modalities of indirect aggression, such as verbal versus relational aggression. Researchers seeking precise information regarding the dimensionality and factorial validity of the NPAS must consult the primary reference by Loeber et al. (1998) and subsequent methodological studies that have utilized and analyzed the instrument.

Instrument

Test Type: Self-Report Questionnaire/Behavioral Checklist

Format: The scale format varies, with some applications comprising 30 items. However, the version commonly referenced for youth assessment consists of 16 items. Responses are typically rated using a Likert-style frequency scale.

Language Available: English (Primary publication language)

Population Group: Youth (Children and Adolescents) and Adults

Age Group: Elementary, Middle, and High School students, as well as general adult populations.

Population Details: The scale has been widely applied across diverse populations to study the prevalence and correlates of aggressive behaviors in various settings, including schools and clinical environments.

Test Methodology: The scale employs a frequency rating system. For the 16-item youth version, a 3-point scale is utilized: Not true (0), Sometimes true (1), and Very true (2). For scoring consistency regarding the construct, all positive responses are treated as equivalent; specifically, responses of “Very true” (2) are recoded to “Sometimes true” (1). All scores are then summed, with higher total scores indicating a greater frequency of non-physical aggressive behavior.

Keywords

Peer Relationships, Delinquency, Verbal Aggression, Behavioral Assessment, Developmental Psychology, Clinical Assessment, Antisocial Behavior

Authors

Author ORCID Identifier: Not specified in source material.

Affiliation Email addresses: Not specified in source material.

Correspondence Address: Not specified in source material.

Permissions & Fee and Test Year

The Non-Physical Aggression Scale was published in 1998 as part of a significant research initiative, establishing this year as the primary test year reference.

Formal permissions for the use of the scale should be secured from the primary authors (Loeber, Farrington, Stouthamer-Loeber, & Van Kammen) or the original publisher, Lawrence Erlbaum Associates. While the instrument is documented in public health resources, suggesting broad availability for academic use, researchers are strongly advised to obtain formal authorization prior to administration.

Reference’s

The core instrument details are found in the following academic publication:

• Loeber, R., Farrington, D.P., Stouthamer-Loeber, M., & Van Kammen, W.B. (1998). Antisocial behavior and mental health problems: explanatory factors in childhood and adolescence. Mahwah, NJ: Lawrence Erlbaum Associates.

The specific 16-item version used for youth assessment is documented on pages 184-185 of Measuring Violence-Related Attitudes, Behaviors, and Influences Among Youths: A Compendium of Assessment Tools. The original PDF can be downloaded here: http://www.cdc.gov/violenceprevention/pdf/YV_Compendium.pdf.

Items of the Non-Physical Aggression Scale

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

1. You argue a lot.
2. You brag.
3. You try to get a lot of attention.
4. You disobey your parents.
5. You disobey at school.
6. You don’t get along with other kids.
7. You are jealous of others.
8. You scream a lot.
9. You show off or clown.
10. You are stubborn.
11. You swear or use dirty language.
12. You tease others a lot.
13. You have a hot temper.
14. You threaten to hurt people.
15. You are louder than other kids.
16. You sulk or pout a lot.