A Quasi-Experimental Analysis of Lethal Means Assessment and Risk for Subsequent Suicide Attempts and Deaths.

Abstract

Counseling on access to lethal means is highly recommended for patients with suicide risk, but there are no formal evaluations of its impact in real-world settings. Evaluate whether lethal means assessment reduces the likelihood of suicide attempt and death outcomes. Quasi-experimental design using an instrumental variable to overcome confounding due to unmeasured patient characteristics that could influence provider decisions to deliver lethal means assessment. Kaiser Permanente Colorado, an integrated health system serving over 600,000 members, with comprehensive capture of all electronic health records, medical claims, and death information. Adult patients who endorsed suicide ideation on the Patient Health Questionnaire-9 (PHQ-9) depression screener administered in behavioral health and primary care settings from 2010 to 2016. Provider documentation of lethal means assessment in the text of clinical notes, collected using a validated Natural Language Processing program. Main outcome was ICD-9 or ICD-10 codes for self-inflicted injury or suicide death within 180days of index PHQ-9 event. We found 33% of patients with suicide ideation reported on the PHQ-9 received lethal means assessment in the 30days following identification. Lethal means assessment reduced the risk of a suicide attempt or death within 180days from 3.3 to 0.83% (p = .034, 95% CI = .069-.9). Unmeasured suicide prevention practices that co-occur with lethal means assessment may contribute to the effects observed. Clinicians should expand the use of counseling on access to lethal means, along with co-occurring suicide prevention practices, to all patients who report suicide ideation.