Columbia Suicide Severity Rating Scale (C-SSRS)

1. Abstract

The Columbia Suicide Severity Rating Scale (C-SSRS) is a semi-structured clinical interview and assessment instrument designed to quantify the full spectrum of suicidal ideation and suicidal behavior. Developed by Kelly Posner and colleagues at the Columbia University Medical Center, the instrument addresses a historical lack of standardization in suicidology by establishing an empirically grounded taxonomy that cleanly delineates passive death wishes, active suicidal ideation, preparatory behaviors, interrupted and aborted attempts, actual attempts, and non-suicidal self-injurious behavior (NSSI). The C-SSRS systematically evaluates suicidal ideation across five hierarchical threshold levels ranging from passive death wishes to active ideation with specific plan and intent. When ideation is endorsed, an additional subscale quantifies the intensity of ideation across five dimensional metrics: frequency, duration, controllability, deterrents, and reasons for ideation, yielding an intensity score between 2 and 25. The behavioral section records the occurrence, frequency, and both actual and potential medical lethality of suicidal acts.

Extensive psychometric investigations across diverse clinical populations—including adult psychiatric inpatients, outpatient populations, pediatric and adolescent samples, and participants in randomized pharmaceutical clinical trials—have demonstrated robust psychometric properties. The C-SSRS exhibits exceptional internal consistency for the ideation intensity subscale (Cronbach’s α ranging from .73 to .95), high inter-rater reliability (intraclass correlation coefficients and Cohen’s κ ≥ .90), strong convergent validity with established measures such as the Scale for Suicide Ideation (SSI) and the Beck Depression Inventory (BDI) suicide item, and divergent validity separating suicidal behavior from non-suicidal deliberate self-harm. Most crucially, prospective longitudinal studies have established the predictive validity of the scale, showing that endorsement of higher-severity ideation (specifically active ideation with intent or plan) and suicidal behavior confers a significantly heightened hazard ratio for prospective suicide attempts. Consequently, the U.S. Food and Drug Administration (FDA) and international regulatory agencies have designated the C-SSRS as the gold standard for prospective suicidality monitoring in clinical trials.

2. Keywords

Columbia Suicide Severity Rating Scale, C-SSRS, suicidal ideation, suicidal behavior, suicide risk assessment, suicide attempt, self-injurious behavior, psychometrics, clinical trials, FDA mandate, risk stratification, suicidology

3. Authors

The Columbia Suicide Severity Rating Scale was developed by an interdisciplinary team of leading researchers in child, adolescent, and adult suicidology based primarily at the Columbia University Medical Center and the New York State Psychiatric Institute, in collaboration with investigators at the University of Pennsylvania and the University of Pittsburgh:

• Kelly Posner, Ph.D. — Professor of Psychiatry, Columbia University Vagelos College of Physicians and Surgeons; Director of The Columbia Lightship and The Center for Suicide Risk Assessment at the New York State Psychiatric Institute, New York, NY.
• Gregory K. Brown, Ph.D. — Research Associate Professor of Clinical Psychology in Psychiatry, Perelman School of Medicine, University of Pennsylvania; Director of the Penn Center for the Prevention of Suicide, Philadelphia, PA.
• Barbara Stanley, Ph.D. (1949–2023) — Professor of Medical Psychology in Psychiatry, Columbia University Irving Medical Center; Director of Suicide Prevention Training, Implementation, and Evaluation at the New York State Psychiatric Institute, New York, NY.
• David A. Brent, M.D. — Academic Chief, Child and Adolescent Psychiatry, Endowed Chair in Suicide Studies, Professor of Psychiatry, Pediatrics, Epidemiology, and Clinical and Translational Science, University of Pittsburgh School of Medicine, Pittsburgh, PA.
• Kseniya V. Yershova, Ph.D. — Research Scientist, Department of Psychiatry, Columbia University and New York State Psychiatric Institute, New York, NY.
• Maria A. Oquendo, M.D., Ph.D. — Ruth Meltzer Professor and Chair of the Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania; Former President of the American Psychiatric Association (APA).

4. Purpose

Historically, the assessment of suicide risk and suicidal phenotypes in both clinical research and healthcare delivery was plagued by severe semantic heterogeneity and methodological inconsistencies. Terms such as “suicidal gesture,” “threatened suicide,” “parasuicide,” and “suicidality” were applied inconsistently across disciplines and studies, conflating non-suicidal self-injury with lethal self-directed violence and obscuring the distinction between passive morbid contemplation and concrete lethal intent. This conceptual ambiguity reached a critical juncture in the early 2000s when the U.S. Food and Drug Administration initiated safety reviews concerning the emergence of suicidal ideation and behavior in pediatric clinical trials evaluating selective serotonin reuptake inhibitors (SSRIs). Existing surveillance tools failed to distinguish between true suicidal intent, non-suicidal somatic manifestations, and ambiguous self-harm.

The Columbia Suicide Severity Rating Scale was developed specifically to address this diagnostic vacuum by providing a standardized, operationalized, and clinically grounded taxonomy. The overarching purpose of the instrument encompasses four major domains:

1. Standardized Phenomenological Classification: The C-SSRS maps self-directed thoughts and actions onto mutually exclusive, clearly defined constructs. It isolates suicidal intent—defined as the implicit or explicit desire to end one’s life—thereby definitively separating suicidal behaviors from non-suicidal self-injurious behavior (NSSI), wherein self-harm is enacted without death-oriented intent (e.g., for emotion regulation or distress relief).
2. Prospective Safety Monitoring in Clinical Trials: In 2012, the FDA issued formal guidance mandating prospective suicidality monitoring in commercial pharmaceutical trials across psychiatric and non-psychiatric indications involving central nervous system active agents. The C-SSRS serves as the standard regulatory benchmark to assess treatment-emergent suicidal ideation and behavior, quantifying whether novel pharmacotherapies increase, diminish, or have no effect on suicidal trajectories.
3. Clinical Triage, Risk Stratification, and Decision Support: In emergency departments, inpatient psychiatric units, primary care clinics, correctional facilities, and educational institutions, the C-SSRS functions as a front-line clinical triage instrument. By identifying the specific hierarchical level of ideation (e.g., Level 4 intent without plan versus Level 5 intent with plan) and distinguishing aborted/interrupted attempts from actual attempts, clinicians can implement targeted clinical pathways, determine optimal levels of psychiatric observation, and design personalized safety plans (such as the Stanley-Brown Safety Planning Intervention).
4. Longitudinal Tracking of Treatment Response: By decoupling ideation severity from ideation intensity (frequency, duration, controllability, deterrents, and reasoning), the C-SSRS enables researchers and clinicians to track granular fluctuations in suicidal cognitive burden over the course of psychotherapeutic or somatic interventions, capturing therapeutic gains even before absolute ideation remission is achieved.

5. Psychological Construct

The C-SSRS operationalizes suicidality as a multidimensional phenomenon comprising two primary behavioral domains—Suicidal Ideation and Suicidal Behavior—interlinked by the continuous cognitive construct of Ideation Intensity. These constructs are framed by cognitive, motivational, and behavioral markers grounded in contemporary empirical suicidology.

5.1 Suicidal Ideation Severity

Suicidal ideation is conceptualized as a hierarchical, progressive continuum characterized by escalating degrees of intent, cognitive organization, and lethality planning. The scale evaluates five ordered categories:

• Level 1: Wish to be Dead: Passive thoughts regarding the cessation of life, characterized by a desire to be dead, disappear, or go to sleep and not wake up, without any explicit contemplation of active self-destruction (e.g., “I wish a car would hit me” or “I wish I wouldn’t wake up tomorrow”).
• Level 2: Non-Specific Active Suicidal Thoughts: Active cognition focused on self-inflicted death (e.g., “I want to kill myself” or “I have thought about suicide”), but lacking concrete contemplation of methods, planning, or immediate behavioral commitment.
• Level 3: Active Suicidal Ideation with Any Methods (Not Plan) without Intent to Act: The individual contemplates specific means or methods of self-harm (e.g., thinking about taking an overdose, using a firearm, or jumping from a height) but explicitly disavows any intention to enact those thoughts (“I have thought about overdosing on pills, but I would never actually do it”).
• Level 4: Active Suicidal Ideation with Some Intent to Act, without Specific Plan: Active suicidal ideation accompanied by a distinct, non-zero degree of subjective intent or willingness to execute the self-harming act, although the logistical details, timing, or definitive plan remain unformulated.
• Level 5: Active Suicidal Ideation with Specific Plan and Intent: The most severe manifestation of ideation, wherein the individual has formulated a concrete, operationalized blueprint for suicide (specifying time, place, method, or logistical sequencing) accompanied by explicit or clearly inferred intention to execute the plan.

5.2 Intensity of Ideation

When any form of suicidal ideation is affirmed (Levels 1–5), the interviewer assesses the dimensional cognitive architecture of the ideation during the designated recall window (e.g., lifetime worst-point or recent monitoring interval). This is measured across five sub-dimensions, each scored on a 1-to-5 ordinal scale:

• Frequency: Quantifies how often the thoughts recur, ranging from 1 (“Only once”) to 5 (“Many times that day / Continuous”).
• Duration: Measures the temporal persistence of ideation episodes, from 1 (“Fleeting, a few seconds or minutes”) to 5 (“Persistent for more than 8 hours / continuous throughout the day”).
• Controllability: Assesses executive cognitive control and voluntary thought suppression, ranging from 1 (“Easily controlled; respondent can readily dismiss thoughts”) to 5 (“No control whatsoever; thoughts consume attention without ability to divert”).
• Deterrents: Evaluates internal and external protective factors (e.g., religious beliefs, familial responsibility, fear of death/injury, pet care), ranging from 1 (“Deterrents definitely stop you from attempting suicide”) to 5 (“Deterrents are completely ineffective or non-existent”).
• Reasons for Ideation: Probes motivational etiology, ranging from 1 (“To get attention, revenge, or a reaction from others”), to intermediate categories representing mixed motivation, up to 5 (“Solely to end or stop the emotional/physical pain; to be dead completely”).

5.3 Suicidal Behavior Taxonomy

The behavioral section records distinct, observable acts categorized through objective behavioral criteria and the presence or absence of self-destructive intent:

• Actual Attempt: A potentially self-injurious behavior undertaken with at least some non-zero intention to die as a consequence of the act. Actual physical injury or tissue damage is not required; if a person pulls a trigger of an unloaded gun believing it to be loaded, it constitutes an attempt. If intent is absent, the behavior cannot be classified as an attempt.
• Interrupted Attempt: A scenario wherein an individual initiates overt physical steps toward enacting suicide (e.g., holding a blade to a vein, standing on a ledge, loading a weapon), but is stopped by an outside person or circumstance prior to inflicting damage or completing the act.
• Aborted (Self-Interrupted) Attempt: An event wherein the individual begins preparatory behavioral execution (e.g., placing pills in the mouth, positioning a noose) but experiences an internal shift in volition and halts the act prior to the infliction of injury.
• Preparatory Acts or Behaviors: Concrete actions undertaken toward facilitating a future attempt, including acquiring lethal means (purchasing a firearm, stockpiling medications), logistical preparations (drafting suicide notes, changing wills, giving away valued possessions), or site surveillance.
• Non-Suicidal Self-Injurious Behavior (NSSI): Intentional self-inflicted physical harm executed entirely devoid of any intent to terminate life, typically performed for emotion-focused coping, affect regulation, self-punishment, or interpersonal communication.

6. Theoretical Framework

The architecture of the C-SSRS integrates core tenets from psychological, cognitive-behavioral, and epidemiological theories of suicide. Primarily, it embodies the conceptual framework of the Ideation-to-Action Framework in suicidology, as articulated in modern models such as the Interpersonal Psychological Theory of Suicide (IPTS) developed by Thomas Joiner, the Three-Step Theory (3ST) by Klonsky and May, and the Cognitive Model of Suicidal Behavior formulated by Aaron T. Beck and Gregory K. Brown.

6.1 The Ideation-to-Action Dichotomy

A foundational tenet of modern suicidology is that the psychological processes driving the emergence of suicidal thoughts are fundamentally distinct from the processes that drive lethal action. Historically, risk scales amalgamated depressive symptoms, hopelessness, thoughts of death, and past attempts into a single undifferentiated composite score. The C-SSRS operationalizes the ideation-to-action distinction by separating the cognitive manifestations of suicidal desire from the behavioral enactments of capability. By isolating active planning, explicit intent, and preparatory behavior, the C-SSRS mirrors Joiner’s construct of the “acquired capability for suicide”—the habituation to fear and physical pain required to cross the psychological threshold from thought into lethal action.

6.2 Cognitive-Behavioral Substrates

Drawing on Beck’s cognitive theory, suicidal behavior is conceptualized as an executive failure within a cognitive “suicidal mode.” In this state, cognitive rigidity, attentional fixation, and pervasive hopelessness converge to frame death as the only viable escape from intractable psychological pain (psychache, per Edwin Shneidman). The C-SSRS Intensity of Ideation subscale captures this cognitive constriction: as frequency and duration escalate, controllability drops to zero, and deterrents dissolve, the individual enters an acute presuicidal crisis characterized by high risk of lethal transition.

6.3 Phenomenological Precision

The instrument directly aligns with O’Carroll and colleagues’ (1996) seminal nomenclature recommendations for suicide assessment. By anchoring classifications to explicit operational criteria—specifically isolating self-directed intent from non-suicidal motivations—the C-SSRS provides an empirically defensible framework that mitigates clinician bias and eliminates diagnostic confusion in both acute clinical settings and blinded pharmaceutical research.

7. Validity

The validity of the C-SSRS has been demonstrated across dozens of independent empirical trials, spanning adult psychiatric cohorts, adolescent treatment trials, emergency medicine registries, and cross-national epidemiological research.

7.1 Construct and Convergent Validity

In the seminal multisite validation study conducted by Posner et al. (2011), published in the American Journal of Psychiatry, the C-SSRS was evaluated across three distinct samples: the Treatment of Adolescent Suicide Attempters (TASA) study, the Treatment of Resistant Depression in Adolescents (TORDIA) study, and an adult psychiatric emergency department cohort. Convergent validity was established via strong, statistically significant correlations with benchmark suicide assessment instruments:

• The C-SSRS ideation severity and intensity subscales demonstrated robust correlations with the Scale for Suicide Ideation (SSI), with Pearson correlation coefficients ranging from r = .63 to r = .74 across adolescent and adult cohorts (p < .001).
• The ideation severity levels exhibited strong positive associations with the suicide item (Item 9) of the Beck Depression Inventory (BDI) (r = .56 to .68, p < .001) and the suicide item of the Hamilton Depression Rating Scale (HAM-D).

7.2 Divergent and Discriminant Validity

The C-SSRS exhibits excellent discriminant validity, cleanly distinguishing between suicidal behavior and non-suicidal self-injury. In validation cohorts, patients engaging exclusively in NSSI scored significantly lower on C-SSRS ideation intensity and suicidal intent markers compared to individuals who engaged in actual suicide attempts. Furthermore, ideation intensity dimensions cleanly separated individuals experiencing transient, manageable death wishes from those experiencing relentless, unmanageable suicidal obsessions.

7.3 Predictive Validity

The predictive validity of the C-SSRS represents its most significant empirical contribution. Longitudinal prospective studies consistently confirm that specific C-SSRS thresholds prospectively predict suicide attempts:

• Predictive Utility of High-Level Ideation: In the TASA trial, adolescents endorsing C-SSRS Level 4 (intent without plan) or Level 5 (intent with plan) at baseline had a four- to eight-fold increase in the hazard of a subsequent suicide attempt during the follow-up window compared to those with lower ideation or no ideation (Hazard Ratio [HR] = 4.41 to 8.79, p < .001).
• Predictive Power of Aborted and Interrupted Attempts: Research by Posner et al. (2011) and subsequent trials (e.g., Conway et al., 2017) demonstrated that individuals reporting past aborted or interrupted attempts had prospective attempt rates comparable to, or exceeding, those who had engaged in actual attempts, confirming that these preparatory behaviors represent severe, actionable clinical indicators rather than benign events.
• Emergency Department Risk Stratification: In large-scale emergency department investigations (e.g., Boudreaux et al., 2016), positive screening on C-SSRS ideation items predicted actual suicide attempts within 6 to 12 months post-discharge, demonstrating high sensitivity and clinically actionable specificity.

8. Reliability

The reliability of the C-SSRS has been evaluated through indices of internal consistency, inter-rater concordance, and test-retest stability across multiple clinical and research environments.

8.1 Internal Consistency

The internal consistency of the Intensity of Ideation subscale has consistently demonstrated acceptable to excellent psychometric standards:

• In the original psychometric investigation by Posner et al. (2011), Cronbach’s α for the Intensity of Ideation subscale was .73 in the TASA adolescent cohort, .74 in the TORDIA cohort, and .93 to .95 in the adult psychiatric emergency department sample.
• Subsequent cross-cultural validation studies (e.g., in Spanish, Swedish, French, and Chinese cohorts) have reported Cronbach’s alpha values regularly exceeding .80 for the dimensional intensity score, reflecting cohesive item covariance across divergent linguistic and sociocultural contexts.

8.2 Inter-Rater Reliability

Because the C-SSRS is primarily structured as a semi-structured clinician-administered interview, inter-rater reliability is vital. In calibration trials involving blind re-ratings of audio-recorded and videotaped interviews:

• Inter-rater agreement for the five-level Suicidal Ideation Severity scale yielded intraclass correlation coefficients (ICCs) between .95 and .99, with Cohen’s κ statistics ranging from .89 to .97.
• Classification of Suicidal Behavior categories (actual attempt, interrupted attempt, aborted attempt, preparatory acts, and NSSI) achieved Cohen’s κ values between .92 and 1.00, demonstrating exceptional concordance when raters have undergone standardized certification.

8.3 Test-Retest Reliability and Longitudinal Stability

Test-retest assessments conducted over short assessment intervals (e.g., 24 to 48 hours) among stable clinical cohorts showed substantial stability, with reliability coefficients exceeding .85 for ideation severity. Over longer horizons, scores systematically fluctuate in expected correspondence with clinical trajectory and treatment response, confirming the scale’s sensitivity to change over time.

9. Factor Analysis

The latent structural architecture of the C-SSRS has been examined using both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) to evaluate whether the instrument aligns with its theoretical multidimensional design.

9.1 Exploratory and Confirmatory Structural Findings

Initial factor analytic work conducted by Posner and colleagues supported a dual-construct framework separating Suicidal Ideation Severity from Suicidal Behavior. Subsequent structural equation modeling across broad psychiatric samples has refined this model:

• Two-Factor Model: A primary CFA model proposed by Mundt et al. (2013) and corroborated by Giddens et al. (2014) validated a two-factor latent solution: Factor 1 representing Cognitive Ideation / Suicidal Severity and Intensity, and Factor 2 representing Behavioral Enactment / Suicidal Actions. Model fit indices in adult psychiatric cohorts showed excellent goodness-of-fit: Comparative Fit Index (CFI) = .97 to .99, Tucker-Lewis Index (TLI) = .96 to .98, and Root Mean Square Error of Approximation (RMSEA) = .038 to .052.
• Three-Factor Model: In specialized emergency and acute crisis populations, CFAs have occasionally supported a three-factor solution dividing the scale into: (1) Passive/Non-specific Ideation, (2) Active Intentional Ideation with Method and Planning, and (3) Suicidal Actions and Preparatory Behaviors. This structure reinforces the ordinal severity hierarchy of the ideation items.

9.2 Factor Loadings and Item Performance

Within the cognitive ideation intensity domain, standardized factor loadings systematically exceed conventional thresholds:

• Frequency: Standardized factor loading λ = .78 to .89.
• Duration: Standardized factor loading λ = .81 to .91.
• Controllability: Standardized factor loading λ = .72 to .86.
• Deterrents: Standardized factor loading λ = .64 to .77.
• Reasons for Ideation: Standardized factor loading λ = .68 to .80.

Item response theory (IRT) analyses have further demonstrated that the C-SSRS items display high discrimination parameters (α > 1.5) and cleanly spaced difficulty/threshold parameters (β), verifying that the progression from passive death wishes (Level 1) to active ideation with plan and intent (Level 5) measures escalating latent severity on a true unidimensional continuum.

10. Instrument / Measurement Tool

The Columbia Suicide Severity Rating Scale is detailed structurally below:

• Test Type: Semi-structured clinical interview, clinician-rated assessment, or trained-interviewer rating scale (with validated self-report and electronic screening variants available).
• Target Population: Children, adolescents, and adults across psychiatric, medical, correctional, military, and clinical research settings.
• Assessment Windows: Typically administered as a “Lifetime / Recent” baseline version (assessing lifetime occurrences and worst-point ideation, as well as the prior 1 to 6 months) followed by “Since Last Visit” monitoring versions for longitudinal tracking.
• Item Count: 10 primary operational categories (5 suicidal ideation items, 5 suicidal behavior items) supplemented by 5 intensity of ideation items, plus lethality scoring metrics.
• Response Formats:
  • Suicidal Ideation and Suicidal Behavior: Dichotomous Yes / No responses.
  • Intensity of Ideation Dimensions: 1 to 5 ordinal scale for each of the five dimensions (Frequency, Duration, Controllability, Deterrents, Reasons for Ideation).
• Scoring and Quantification Rules:
  • Suicidal Ideation Severity: Scored from 0 to 5 based on the highest affirmed level (0 = No ideation; 1 = Wish to be dead; 2 = Non-specific active thoughts; 3 = Active thoughts with methods; 4 = Active thoughts with some intent; 5 = Active thoughts with specific plan and intent).
  • Intensity of Ideation Score: Calculated as the arithmetic sum of the five 1–5 dimension ratings, yielding a composite score ranging from 2 to 25 (only administered if ideation is endorsed; unendorsed ideation yields a score of 0).
  • Suicidal Behavior Subscale: Assesses the presence/absence and frequency of 5 distinct behavioral categories (preparatory acts, aborted attempt, interrupted attempt, actual attempt, non-suicidal self-injurious behavior), along with actual and potential lethality ratings scored on an ordinal medical lethality scale (0 = No physical damage; 1 = Minor damage; 2 = Moderate damage; 3 = Severe hospitalization; 4 = Intensive care; 5 = Death).

11. Permissions & Fee and Test Year

The Columbia Suicide Severity Rating Scale was formalized and published in its validated structure in 2011 (following widespread research dissemination starting in 2007 through the FDA suicidality monitoring initiatives). In alignment with the mission of Dr. Kelly Posner and The Columbia Lighthouse Project, the C-SSRS is made publicly accessible and free of charge for clinical practice, academic research, healthcare systems, schools, public health surveillance, and non-profit initiatives to democratize suicide prevention worldwide.

Commercial entities—specifically pharmaceutical companies, contract research organizations (CROs), and commercial sponsors conducting clinical trials for regulatory drug approvals—are required to coordinate through the Columbia University / Center for Suicide Risk Assessment infrastructure or authorized licensing vendors to obtain official certification, certified translations, and required investigator training modules. Full information, downloadable versions in over 140 languages, and free public clinical training modules are available at the official Columbia Lighthouse Project website.

12. References

• Beck, A. T., Kovacs, M., & Weissman, A. (1979). Assessment of suicidal intention: The Scale for Suicide Ideation. Journal of Consulting and Clinical Psychology, 47(2), 343–352. https://doi.org/10.1037/0022-006X.47.2.343
• Boudreaux, E. D., Camargo, C. A., Arias, E. A., Sullivan, A. F., Allen, M. H., Goldstein, A. B., Manton, A. P., Espinola, J. A., & Miller, I. W. (2016). Improving suicide risk screening and detection in the emergency department: The ED-SAFE study. The American Journal of Preventive Medicine, 50(4), 445–453. https://doi.org/10.1016/j.amepre.2015.09.029
• Conway, P. M., Erlangsen, A., Teasdale, T. W., Jakobsen, I. S., & Larsen, K. J. (2017). Predictive validity of the Columbia-Suicide Severity Rating Scale for prospective suicide attempts in psychiatric inpatients. Psychiatry Research, 252, 175–182. https://doi.org/10.1016/j.psychres.2017.02.064
• Giddens, J. M., Sheehan, K. H., & Sheehan, D. V. (2014). The Columbia-Suicide Severity Rating Scale (C-SSRS): Has the “gold standard” become a liability? Innovations in Clinical Neuroscience, 11(9-10), 66–80.
• Joiner, T. E. (2005). Why people die by suicide. Harvard University Press.
• Klonsky, E. D., & May, A. M. (2015). The Three-Step Theory (3ST): A new theory of suicide rooted in the “ideation-to-action” framework. International Journal of Cognitive Therapy, 8(2), 114–129. https://doi.org/10.1521/ijct.2015.8.2.114
• Mundt, J. C., Greist, J. H., Jefferson, J. W., Federico, M., Mann, J. J., & Posner, K. (2013). Prediction of suicidal behavior in clinical research by lifetime suicidal ideation and behavior as measured with the Columbia-Suicide Severity Rating Scale. The Journal of Clinical Psychiatry, 74(9), 887–893. https://doi.org/10.4088/JCP.13m08398
• O’Carroll, P. W., Berman, A. L., Maris, R. W., Moscicki, E. K., Tanney, B. L., & Silverman, M. M. (1996). Beyond the Tower of Babel: A nomenclature for suicidology. Suicide and Life-Threatening Behavior, 26(3), 237–252. https://doi.org/10.1111/j.1943-278X.1996.tb00609.x
• Posner, K., Brown, G. K., Stanley, B., Brent, D. A., Yershova, K. V., Oquendo, M. A., Currier, G. W., Melvin, G. A., Greenhill, L., Shen, S., & Mann, J. J. (2011). The Columbia-Suicide Severity Rating Scale: Initial validity and internal consistency findings from three multisite studies with adolescents and adults. American Journal of Psychiatry, 168(12), 1266–1277. https://doi.org/10.1176/appi.ajp.2011.10111704
• U.S. Food and Drug Administration. (2012). Guidance for industry: Suicidal ideation and behavior: Developing drugs for treatment or non-psychiatric drugs—prospective assessment of risk in clinical trials. U.S. Department of Health and Human Services, Food and Drug Administration, Center for Drug Evaluation and Research (CDER).

13. Items of the Scale