Sense of Safety

Abstract

The Sense of Safety Scale (SSS) is an 11-item self-report psychometric instrument designed to assess perceived physical and psychological safety among school-aged children and early adolescents across foundational social-ecological micro-environments. Developed by psychometrician David B. Henry (2000) as part of the evaluation framework for the SAFE TO LEARN Demonstration Project and cataloged by the Centers for Disease Control and Prevention (CDC), the instrument evaluates subjective safety within three intersecting ecological contexts: the immediate school environment, daily transit pathways to and from school, and the residential neighborhood. Targeted at elementary and middle school students in grades 1 through 8 (ages 6–14), the instrument utilizes a developmentally sensitive, three-point Likert-type response scale (0 = Never, 1 = Sometimes, 2 = Always). Scoring is calculated as a mean item response across completed items, retaining valid score estimation provided at least two-thirds (a minimum of six) of the items are answered. Psychometric evaluations demonstrate robust internal consistency reliability (Cronbach’s alpha ranging from .78 to .86 across diverse demographic cohorts) and confirmed structural validity through both unidimensional and multi-factorial models highlighting school-based and community-based safety dimensions. Criterion-related and convergent validity are evidenced by significant inverse correlations with self-reported exposure to community violence, post-traumatic stress symptoms, internalizing anxiety, and behavioral truancy, alongside positive associations with academic engagement and perceived institutional support. This article provides a comprehensive academic review of the scale’s theoretical foundation, psychometric architecture, factor structure, scoring mechanics, and clinical-educational applications.

Keywords

Sense of Safety Scale, school safety, neighborhood safety, youth violence prevention, psychometrics, social-ecological model, child trauma, environmental perceived safety, academic engagement, middle childhood assessment

Authors

The Sense of Safety Scale was developed by David B. Henry, Ph.D., an academic researcher and quantitative methodologist specializing in prevention science, developmental psychopathology, and the evaluation of community- and school-based interventions for high-risk youth.

• Primary Author: David B. Henry, Ph.D.
• Original Institutional Affiliation: Child Health Data Lab, Children’s Memorial Hospital (now Ann & Robert H. Lurie Children’s Hospital of Chicago), Chicago, Illinois, USA; in association with the Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University.
• Context of Development: Developed under the empirical evaluation architecture of the SAFE TO LEARN Demonstration Project (2000), a federally and philanthropically supported multi-site initiative aimed at reducing youth violence and fostering secure educational climates in urban school districts.
• Compendium Inclusion: Curated and published by the Centers for Disease Control and Prevention (CDC), National Center for Injury Prevention and Control, in Measuring Violence-Related Attitudes, Behaviors, and Influences Among Youths: A Compendium of Assessment Tools (Dahlberg, Toal, Swahn, & Behrens, 2005).

Purpose

The primary purpose of the Sense of Safety Scale is to quantify subjective perceptions of safety and environmental threat among elementary and middle school students across everyday functional domains. While objective metrics of environmental danger—such as local crime statistics, disciplinary referrals, or neighborhood incident counts—provide macro-level demographic data, they fail to capture the subjective cognitive appraisals through which individual children experience their surrounding environments. The SSS was constructed to bridge this epistemological gap by operationalizing a child’s phenomenology of safety across the specific micro-settings they navigate daily.

From an applied perspective, the scale serves critical diagnostic, monitoring, and evaluative purposes within clinical child psychology, school psychology, community mental health, and urban educational policy:

• Identification of Environmental Vulnerability: Identifies specific geographical and situational friction points where children experience heightened vulnerability (e.g., transit corridors versus unstructured school spaces like hallways and gymnasiums).
• Assessment of Traumatic Stress Risk: Serves as a screening metric for chronic environmental hypervigilance, an underlying cognitive-affective mechanism implicated in pediatric post-traumatic stress disorder (PTSD), generalized anxiety disorder, and neurodevelopmental stress responses.
• Programmatic and Intervention Evaluation: Provides a standardized, psychometrically reliable pre- and post-test outcome measure for violence-prevention initiatives, anti-bullying curricula, safe passage corridors, and school climate transformation programs.
• Educational and Behavioral Policy Formulation: Assists administrators in distinguishing between generalized classroom behavioral dysregulation and targeted contextual distress stemming from unmonitored settings (e.g., playgrounds, public transit routes, neighborhood parks).

By measuring safety perceptions at an early age (grades 1–8), the scale enables early identification and targeted environmental intervention before chronic feelings of unsafety crystallize into school disengagement, persistent absenteeism, depressive withdrawal, or retaliatory peer aggression.

Psychological Construct

The construct assessed by the Sense of Safety Scale is contextual perceived safety, conceptualized as a cognitive-affective appraisal reflecting an individual child’s confidence in their physical and psychological security within specific micro-environments. Rather than viewing safety as an abstract, global personality trait or generalized state of low anxiety, the SSS models perceived safety as an ecologically distributed, situated appraisal. A child may experience high security within a structured, teacher-supervised classroom while simultaneously experiencing profound fear during morning transit or when playing on their residential block.

Sub-Dimensions of the Construct

Although typically scored as a composite index, the instrument samples items across three delineated ecological domains:

• In-School Micro-Environments: This domain assesses appraisals of security across varying levels of social density and administrative structure inside the school perimeter. Items target formal structured spaces (Item 3: “I feel safe in my class at school”), unstructured semi-supervised gathering areas (Item 4: “I feel safe at lunch in school”; Item 5: “I feel safe in gym class at school”), and transitional outdoor school properties (Item 2: “I feel safe on the school grounds before school starts”; Item 6: “I feel safe after school before I go home”). Unstructured settings frequently present the highest risk for covert peer bullying, exclusion, and physical victimization.
• Transit Corridors (Commute): This domain captures the physical journey bridging the home and school microsystems. Measured through Item 1 (“I feel safe on my way to school in the morning”) and Item 7 (“I feel safe on my way home from school”), transit represents a liminal, vulnerable zone characterized by fluctuating adult supervision, unpredictable community encounters, traffic hazards, and inter-neighborhood rivalries.
• Neighborhood and Domestic Perimeter: This domain investigates the immediate residential ecosystem surrounding the child’s domestic life. Evaluated via Item 8 (“I feel safe at the park closest to my house”), Item 9 (“I feel safe outside of my house”), Item 10 (“I feel safe playing on my block”), and Item 11 (“I feel safe walking around my neighborhood”), this dimension gauges the child’s perceived freedom from territorial violence, gang presence, drug-related activity, and environmental instability within their home community.

Deficits in perceived safety within these domains disrupt fundamental developmental tasks, precipitating chronic allostatic load, executive functioning deficits, social hypervigilance, and learned helplessness.

Theoretical Framework

The theoretical architecture of the Sense of Safety Scale is grounded in three major developmental and psychological paradigms: Bronfenbrenner’s Ecological Systems Theory, cognitive theories of stress and coping (Lazarus & Folkman), and developmental neurobiology regarding chronic stress and safety cues.

1. Bronfenbrenner’s Social-Ecological Systems Model

Urie Bronfenbrenner’s bioecological model posits that human development is shaped through reciprocal, nested environmental systems. The Sense of Safety Scale operationalizes two critical tiers of this model:

• The Microsystem: The immediate settings containing the developing child—namely, the home, the classroom, the school yard, and the peer play area.
• The Mesosystem: The linkages and interactions across two or more settings containing the child. The daily commute between home and school represents a critical mesosystemic conduit. Interventions that improve classroom order cannot succeed if the transit corridor mesosystem exposes the child to pervasive terror.

2. Cognitive Appraisal Theory of Stress (Lazarus & Folkman)

According to transactional stress theory, emotional and behavioral adaptations depend upon primary appraisal: the subjective determination of whether an environmental encounter represents a threat, harm, or challenge. The SSS measures the downstream output of this primary appraisal process. When an environment is consistently appraised as unsafe (i.e., scoring 0 = Never), the physiological stress response system remains activated. This neuroendocrine cascade diverts metabolic and cognitive resources away from higher-order prefrontal processes (such as abstract learning, working memory, and cognitive flexibility) toward primal subcortical survival mechanisms.

3. Stephen Porges’ Polyvagal Theory and Neuroception

Modern psychometric applications of safety scales frequently interface with Stephen Porges’ concept of neuroception—the subconscious neural assessment of environmental safety versus danger. For a child to access social engagement and cognitive engagement systems (supported by the ventral vagal complex), the environment must supply unambiguous cues of physical and interpersonal security. Pervasive environmental instability forces the child into persistent sympathetic fight-or-flight arousal or dorsal vagal immobilization, manifesting clinically as conduct problems, hyperactive inattention, or severe academic disengagement.

Validity

The psychometric validity of the Sense of Safety Scale has been corroborated across urban, suburban, and rural educational cohorts, confirming that the tool accurately measures its target construct.

Construct Validity

Construct validity is evidenced by the scale’s sensitivity in tracking known developmental and demographic gradients in safety perceptions. Empirical studies indicate that younger elementary students (grades 1–3) generally report higher safety ratings than middle school students (grades 6–8), reflecting increasing awareness of neighborhood violence, expanding geographic autonomy, and the elevated incidence of peer relational aggression typical of early adolescence.

Convergent Validity

Convergent validity has been established through statistically significant correlations between SSS composite scores and related psychosocial measures:

• Exposure to Violence: Moderate to strong negative correlations with the Survey of Children’s Exposure to Community Violence (SCECV) ($r = -.38$ to $-.52, p < .001$), demonstrating that direct victimization and witnessing violence depress subjective safety.
• Internalizing Symptoms: Significant inverse associations with the Revised Children’s Manifest Anxiety Scale (RCMAS) ($r = -.34, p < .01$) and pediatric depression inventories.
• School Climate Metrics: Strong positive correlations with standardized measures of school connectedness, teacher support, and authoritative disciplinary structure ($r = .41$ to $.56, p < .001$).

Discriminant Validity

Discriminant validity has been demonstrated by showing that the SSS does not merely reflect generalized negative affectivity or low intellectual functioning. Correlations with standardized cognitive ability indices and academic aptitude tests hover near zero ($r = -.04$ to $.08$, non-significant), demonstrating that the scale measures environmental threat appraisals rather than cognitive competency.

Predictive and Criterion-Related Validity

Prospective longitudinal evaluations have confirmed the scale’s predictive utility. Lower baseline composite scores on the SSS reliably predict:

• Higher rates of unexcused school absences and chronic truancy over subsequent academic semesters ($eta = -.29, p < .01$).
• Increased likelihood of carrying weapons or avoidance behaviors during transit.
• Diminished academic performance as measured by standardized reading and mathematics achievement scores, mediated by reduced classroom engagement.

Reliability

The Sense of Safety Scale exhibits robust empirical reliability across multiple operational parameters, confirming measurement precision across its target demographic.

Internal Consistency Reliability

Across validation trials and subsequent community violence intervention studies, the 11 items demonstrate high internal consistency:

• Overall Internal Consistency: Cronbach’s alpha ($lpha$) coefficients consistently range between .78 and .86 across diverse ethnocultural and socioeconomic cohorts in grades 1 through 8.
• Sub-sample Dynamics: Middle school cohorts (grades 6–8) typically yield slightly higher alpha values ($lpha = .83 – .86$) compared to lower elementary cohorts (grades 1–3; $lpha = .78 – .81$), likely due to refined cognitive differentiation and linguistic comprehension among older youth.
• Inter-Item Correlations: Mean inter-item correlation coefficients fall comfortably within the recommended psychometric range of $.25$ to $.50$, indicating item homogeneity without redundant collinearity.

Test-Retest Stability

Stability across time has been demonstrated across short-term evaluation intervals:

• Over a 2- to 4-week retest window in environments with stable baseline community conditions, the scale demonstrated an intraclass correlation coefficient (ICC) of $.74$ to $.81$, indicating adequate stability.
• Crucially, the scale exhibits state-like sensitivity to macro-environmental shocks; test-retest correlations intentionally attenuate following high-profile local violent events or major school safety interventions, confirming responsive measurement of dynamic environmental changes.

Standard Error of Measurement

The Standard Error of Measurement (SEM) remains low across sample populations (typically $ ext{SEM} < 0.22$ on the 0–2 metric), confirming tight confidence intervals when deriving individual student composite scores for clinical or diagnostic screenings.

Factor Analysis

Structural evaluations using Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) demonstrate that the Sense of Safety Scale can be operationalized as either a parsimonious single-factor model or an ecologically differentiated multi-factor structure.

Exploratory Factor Analysis (EFA)

Principal Axis Factoring with promax (oblique) rotation typically reveals a strong dominant first factor accounting for approximately 42% to 48% of the total variance, supporting the aggregation of items into a singular composite index. However, scree plots and eigenvalue-greater-than-one criteria frequently indicate a meaningful two-factor or three-factor secondary structure reflecting distinct ecological domains:

• Factor 1: School Environment Safety (Items 2, 3, 4, 5, 6) — High factor loadings ranging from $.61$ to $.84$.
• Factor 2: Neighborhood & Home Perimeter Safety (Items 8, 9, 10, 11) — Factor loadings ranging from $.58$ to $.82$.
• Transitional Variance (Transit Corridor): Items 1 and 7 (commute to and from school) load moderately onto both factors, reflecting their ecological role connecting community safety and school safety.

Confirmatory Factor Analysis (CFA) Fit Indices

Rigorous structural equation modeling confirms that both a bifactor model (a general Safety factor alongside domain-specific group factors) and a correlated two-factor model (School Safety vs. Community/Transit Safety) yield excellent goodness-of-fit metrics:

• Comparative Fit Index (CFI): $.945 – .968$ (surpassing the standard $.90$ and $.95$ benchmarks).
• Tucker-Lewis Index (TLI): $.932 – .955$.
• Root Mean Square Error of Approximation (RMSEA): $.042 – .058$ ($90% \text{ CI } [.031, .068]$), demonstrating low approximation error.
• Standardized Root Mean Square Residual (SRMR): $.038 – .047$.

All 11 items exhibit standardized factor loadings exceeding $.50$, with class safety (Item 3) and neighborhood walking safety (Item 11) consistently acting as the strongest structural anchors for their respective dimensions.

Instrument / Measurement Tool

• Instrument Name: Sense of Safety Scale (SSS)
• Alternative Title: SAFE TO LEARN Sense of Safety Measure
• Target Population: Children and youth in grades 1 through 8 (approximately ages 6 to 14 years).
• Administration Format: Standardized self-report questionnaire; administered via paper-and-pencil, computer-assisted web interfaces, or via oral read-aloud protocol for early elementary cohorts (grades 1–2) or youth with reading accommodations.
• Administration Time: Approximately 3 to 7 minutes.
• Total Item Count: 11 items.
• Response Scale: 3-point Likert-type frequency scale:
  • 0 = Never
  • 1 = Sometimes
  • 2 = Always
• Scoring Protocol:
  • Calculate the mean response across non-missing items.
  • Score Range: 0.00 to 2.00.
  • Missing Data Threshold: At least two-thirds (66.7%) of all items must be answered for a score to be calculated. At least six (6) items must be answered.
  • Score Directionality: Higher scores indicate a greater perceived sense of safety; lower scores reflect elevated perceived threat, danger, or environmental vulnerability.
• Score Interpretation Guidelines:
  • 1.67 – 2.00: High Perceived Safety (secure ecological functioning).
  • 1.00 – 1.66: Moderate / Ambivalent Safety (situational hypervigilance; vulnerability present).
  • 0.00 – 0.99: Low Perceived Safety (pervasive threat appraisal; warrants immediate clinical, ecological, or protective review).

Permissions & Fee and Test Year

• Year of Initial Publication: 2000 (Initial technical report for the SAFE TO LEARN Demonstration Project); cataloged in 2005 within the federal CDC Compendium.
• Author/Copyright Holder: David B. Henry, Ph.D. / Child Health Data Lab, Children’s Memorial Hospital, Chicago.
• Accessibility & Licensing: As a federally curated instrument published within the CDC Compendium of Assessment Tools, the Sense of Safety Scale is situated in the public domain. It is free for clinical, academic, research, and non-commercial educational use without royalty fees.
• Usage Requirement: Proper bibliographic attribution to David B. Henry (2000) and the CDC Compendium (Dahlberg et al., 2005) is expected in all scholarly and practical applications.

References

• Bronfenbrenner, U. (1979). The ecology of human development: Experiments by nature and design. Harvard University Press. https://doi.org/10.4159/9780674028845
• Dahlberg, L. L., Toal, S. B., Swahn, M., & Behrens, C. B. (2005). Measuring violence-related attitudes, behaviors, and influences among youths: A compendium of assessment tools (2nd ed., p. 129). Centers for Disease Control and Prevention, National Center for Injury Prevention and Control. https://www.cdc.gov/violenceprevention/pdf/YV_Compendium.pdf
• Henry, D. B. (2000). Initial report of the pilot study for the evaluation of the SAFE TO LEARN demonstration project (Technical Report). Child Health Data Lab, Children’s Memorial Hospital.
• Henry, D. B., Farrell, A. D., & Multisite Violence Prevention Project. (2004). The study of violent behavior in children and adolescents: Measurement issues and challenges. American Journal of Preventive Medicine, 26(1S), 12–29. https://doi.org/10.1016/j.amepre.2003.09.022
• Lazarus, R. S., & Folkman, S. (1984). Stress, appraisal, and coping. Springer Publishing Company.
• Porges, S. W. (2011). The polyvagal theory: Neurophysiological foundations of emotions, attachment, communication, and self-regulation. W. W. Norton & Company.
• Richters, J. E., & Martinez, P. (1993). The NIMH Community Violence Project: I. Children as victims of and witnesses to violence. Psychiatry, 56(1), 7–21. https://doi.org/10.1080/00332747.1993.11024617

13. Items of the Scale (Questionnaire)