Social Interaction Anxiety Scale (SIAS)

Abstract

The Social Interaction Anxiety Scale (SIAS) is a 20-item self-report scale developed in 1998 by Mattick and Clarke. Its purpose is to measure social interaction anxiety, which the authors defined as “distress when meeting and talking with other people” (Mattick and Clarke, 1998, p. 457). The scale specifically targets generalized fears related to interpersonal communication rather than circumscribed performance fears.

The SIAS is a valuable clinical and research tool for tracking the severity of social anxiety symptoms over time, particularly for monitoring treatment response. Although it is highly correlated with other measures of Social Phobia, it is recommended that the SIAS be utilized primarily for tracking progress rather than for establishing a definitive differential diagnosis between anxiety disorders.

Keywords

Social Interaction Anxiety Scale, SIAS, Social anxiety, Social phobia, Self-report measure, Psychometric assessment, Anxiety disorders, Treatment outcome.

Authors

Richard P. Mattick, Janet C. Clarke

Purpose

The primary purpose of the SIAS is to provide a reliable and quantifiable measure of the subjective distress associated with general interpersonal interactions. It is designed to assess the cognitive and emotional components of anxiety experienced specifically during social engagement, such as mixing in groups, meeting strangers, or communicating with authority figures.

In clinical practice, the SIAS is widely utilized to establish baseline severity for individuals presenting with social fears and to effectively monitor the efficacy of psychological or pharmacological interventions aimed at reducing these symptoms. Its focus on interaction anxiety makes it distinct from measures that emphasize performance or scrutiny fears.

Construct

The SIAS measures the construct of Social Interaction Anxiety. This construct is characterized by generalized fear, tension, and avoidance related to interpersonal communication and engagement with others. It captures the internal experience of worry about appearing awkward, being unable to maintain conversation, or feeling uncomfortable when alone with another person.

The 20 items cover various facets of social interaction distress, ranging from difficulty making eye contact to worrying about expressing oneself or being nervous when meeting new acquaintances. The scale is scored to reflect the overall severity and pervasiveness of this distress, making it a key instrument for assessing the generalized subtype of Social Phobia.

Validity

The SIAS demonstrates strong evidence of concurrent validity. For instance, Peters (2000) reported a highly significant correlation (r = 0.86, P<0.001) between SIAS scores and scores on the Social Phobia and Anxiety Inventory (SPAI), indicating that the scales tap into similar underlying constructs. Furthermore, convergent validity is supported by findings that clinician-rated severity of Social Phobia is moderately related to SIAS total scores (Brown et al., 1997).

The scale possesses strong sensitivity to treatment change (Cox et al., 1998), highlighting its utility as an outcome measure in intervention studies. However, a limitation noted in the literature is its lack of discriminant validity, as it does not reliably distinguish between individuals diagnosed with Social Phobia and those with other anxiety disorders (Peters, 2000). Consequently, it is recommended that the SIAS be used primarily for tracking symptom trajectory rather than for definitive differential diagnosis.

Reliability

The SIAS is recognized for its sound psychometric properties, although specific reliability coefficients (such as internal consistency and test-retest reliability) are typically detailed in the primary source articles rather than the summary provided. The scale’s high correlation with established measures like the SPAI (Peters, 2000) and its proven effectiveness in detecting treatment-related symptom reduction (Cox et al., 1998) implicitly support its strong internal consistency and temporal stability, confirming its reliability as a clinical measure.

Factor Analysis

The SIAS was developed alongside the Social Phobia Scale (SPS) to differentiate interaction fears from scrutiny/performance fears. Although the original structure suggests a primary focus on interaction anxiety, subsequent factor analyses often confirm that the SIAS primarily measures a single, dominant factor representing generalized social interaction distress. The scale is consistently employed as a unidimensional measure, yielding a single total score reflecting the severity of social interaction anxiety.

Instrument

Test Type: Self-report psychometric scale

Format: 20 items rated on a 5-point Likert scale (0 to 4)

Language Available: English (Original), with numerous translations available in academic literature.

Population Group: Clinical populations (specifically anxiety disorders and Social Phobia) and non-clinical samples.

Age Group: Typically utilized with adolescents and adults.

Population Details: Normative data provided by Peters (2000) indicated an average score of 55.24 (SD=1.97) for a sample of individuals with diagnosed Social Phobia (n=74), compared to a mean of 29.46 (SD=29) for individuals with other anxiety disorders (n=34).

Test Methodology: Respondents select the option (0 to 4) that best reflects how characteristic or true the statement is for them. Items 5, 9, and 11 are reverse-scored. The total score ranges from 0 to 80.

Interpretation Guidelines

Interpretation of the SIAS is based on the total raw score, where higher scores indicate greater levels of social interaction anxiety. Peters (2000) established a recommended cutoff score of 36 for probable Social Phobia. At this threshold, the instrument demonstrated robust diagnostic utility with a sensitivity of 0.93 and a specificity of 0.60, alongside a positive predictive value (PPV) of 0.84 and a negative predictive value (NPV) of 0.78.

Clinical results often include the raw score converted into percentiles using norms derived from clinical samples (e.g., social phobia sample and general anxiety sample). A percentile of 50 in the social phobia sample suggests the client exhibits an average level of symptoms compared to others with the same diagnosis, while percentiles above 50 indicate more severe symptomatology. It is important to note that standardized norms based on a healthy, normal population are not typically used for interpretation.

Keywords

Social Interaction Anxiety Scale, SIAS, Social anxiety, Social phobia, Validity, Reliability, Cutoff score, Assessment tool, Differential diagnosis.

Authors

Author ORCID Identifier: Information not provided in source.

Affiliation Email addresses: Information not provided in source.

Correspondence Address: Information not provided in source.

Permissions & Fee and Test Year

The SIAS was developed and validated in 1998 by Mattick and Clarke. The scale is typically available for research use, but specific information regarding current licensing fees, commercial permissions, and distribution rights is not provided in the original source content. Users are advised to contact the original publishing journal or authors for up-to-date permission requirements.

Reference’s

• Brown, E. J., Turovsky, J., Heimberg, R. G., Juster, H. R., Brown, T. A., & Barlow, D. H. (1997). Validation of the social interaction anxiety scale and the social phobia scale across the anxiety disorders. Psychological Assessment, 1, 21-27.
• Cox, B. J., Ross, L., Swinson, R. P., & Direnfeld, D. M. (1998) A comparison of social phobia outcome measures in cognitive-behavioural group therapy. Behavior Modification, 22, 285-297.
• Mattick, R. P., & Clarke, J. C. (1998). Development and validation of measures of social phobia scrutiny fear and social interaction anxiety1. Behaviour Research and Therapy, 36(4), 455-470. (Developer Reference)
• Peters, L. (2000). Discriminant validity of the Social Phobia and Anxiety Inventory (SPAI), the Social Phobia Scale (SPS) and the Social Interaction Anxiety Scale (SIAS). Behaviour Research and Therapy, 38, 943-950.

Items of the Social Interaction Anxiety Scale (SIAS)

Instructions: For each item, please tap the box to indicate the degree to which you feel the statement is characteristic or true for you.

Scoring Key (0-4):

• 0: Not at all characteristic or true of me
• 1: Slightly characteristic or true of me
• 2: Moderately characteristic or true of me
• 3: Very characteristic or true of me
• 4: Extremely characteristic or true of me

Note: Items 5, 9, and 11 are reverse-scored.

1. I get nervous if I have to speak with someone in authority (teacher, boss, etc.).
2. I have difficulty making eye contact with others.
3. I become tense if I have to talk about myself or my feelings.
4. I find it difficult to mix comfortably with the people I work with.
5. I find it easy to make friends my own age.
6. I tense up if I meet an acquaintance in the street.
7. When mixing socially, I am uncomfortable.
8. I feel tense if I am alone with just one other person.
9. I am at ease meeting people at parties, etc.
10. I have difficulty talking with other people.
11. I find it easy to think of things to talk about.
12. I worry about expressing myself in case I appear awkward.
13. I find it difficult to disagree with another’s point of view.
14. I have difficulty talking to attractive persons of the opposite sex.
15. I find myself worrying that I won’t know what to say in social situations.
16. I am nervous mixing with people I don’t know well.
17. I feel I’ll say something embarrassing when talking.
18. When mixing in a group, I find myself worrying I will be ignored.
19. I am tense mixing in a group.
20. I am unsure whether to greet someone I know only slightly.