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Original Investigation
May 26, 2021

Suicide Risk in Medicare Patients With Schizophrenia Across the Life Span

Author Affiliations
  • 1Department of Psychiatry, Columbia University Irving Medical Center, New York State Psychiatric Institute, New York
  • 2Mailman School of Public Health, Columbia University, New York, New York
  • 3Institute for Health, Health Care Policy and Aging Research, Rutgers University, New Brunswick, New Jersey
  • 4Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey
JAMA Psychiatry. Published online May 26, 2021. doi:10.1001/jamapsychiatry.2021.0841
Key Points

Question  How does the risk of suicide in Medicare patients with schizophrenia vary across the life span?

Findings  In this cohort study of 668 836 patients with schizophrenia and Medicare coverage, the risk of suicide was higher compared with the general US population and was highest among those aged 18 to 34 years and lowest among those 65 years and older. In young adults, suicide risk was associated with a recent history of suicide attempts or self-harm, suicide ideation, and substance use disorders.

Meaning  These findings suggest that suicide prevention efforts for individuals with schizophrenia should include a focus on younger adults with suicidal symptoms and substance use disorders.

Abstract

Importance  Although adults with schizophrenia have an increased risk of suicide, sample size limitations of previous research have hindered characterizations of suicide risk across the life span.

Objective  To describe suicide mortality rates and correlates among adults with schizophrenia across the life span and standardized mortality ratios (SMRs) for suicide compared with the general US population.

Design, Setting, and Participants  Five national retrospective longitudinal cohorts of patients with schizophrenia in the Medicare program from January 1, 2007, to December 31, 2016, were identified by age: 18 to 34, 35 to 44, 45 to 54, 55 to 64, and 65 years or older. Death record information was obtained from the National Death Index. The total cohort included 668 836 Medicare patients with schizophrenia, 2 997 308 years of follow-up, and 2218 suicide deaths. Data were analyzed from September 30, 2020, to March 10, 2021.

Main Outcomes and Measures  For each age group, suicide mortality rates per 100 000 person-years and adjusted hazard ratios (aHRs) with 95% CIs of suicide were determined. Suicide SMRs were estimated for the total cohort and by sex and age cohorts standardized to the general US population by age, sex, and race/ethnicity.

Results  The study population of adults 18 years and older included 668 836 Medicare recipients with schizophrenia (52.5% men, 47.5% women). The total suicide rate per 100 000 person-years was 74.00, which is 4.5 times higher than that for the general US population (SMR, 4.54; 95% CI, 4.35-4.73) and included a rate of 88.96 for men and 56.33 for women, which are 3.4 (SMR, 3.39; 95% CI, 3.22-3.57) and 8.2 (SMR, 8.16; 95% CI, 7.60-8.75) times higher, respectively, than the rates for the general US population. Suicide rates were significantly higher for men (aHR, 1.44; 95% CI, 1.29-1.61) and those with depressive (aHR, 1.32; 95% CI, 1.17-1.50), anxiety (aHR, 1.15; 95% CI, 1.02-1.30), drug use (aHR, 1.55; 95% CI, 1.36-1.76), and sleep disorders (aHR, 1.22; 95% CI, 1.07-1.39), suicidal ideation (aHR, 1.41; 95% CI, 1.22-1.63), and suicide attempts or self-injury (aHR, 2.48; 95% CI, 2.06-2.98). The adjusted hazards of suicide were lower for Hispanic patients (aHR, 0.66; 95% CI, 0.54-0.80) or Black patients (aHR, 0.29; 95% CI, 0.24-0.35) than White patients. The suicide rate declined with age, from 141.95 (SMR, 10.19; 95% CI, 9.29-11.18) for patients aged 18 to 34 years to 24.01 (SMR, 1.53; 95% CI, 1.32-1.77) for patients 65 years or older. The corresponding declines per 100 000 person-years were from 153.80 (18-34 years of age) to 34.17 (65 years or older) for men and from 115.70 (18-34 years of age) to 18.66 (65 years or older) for women. In the group aged 18 to 34 years, the adjusted hazards of suicide risk were significantly increased for patients with suicide attempt or self-injury (aHR, 2.57; 95% CI, 18.20-2.04) and with comorbid drug use disorders (aHR, 1.48; 95% CI, 1.17-1.88), but not with comorbid depressive disorders (aHR, 0.99; 95% CI, 0.38-1.26) during the year before the start of follow-up.

Conclusions and Relevance  In this cohort study of adult Medicare patients with schizophrenia, suicide risk was elevated, with the highest absolute and relative risk among young adults. These patterns support suicide prevention efforts with a focus on young adults with schizophrenia, especially those with suicidal symptoms and substance use.

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    1 Comment for this article
    Schizophrenia: public health issue:
    James Beck, MD, PhD | Harvard medical school
    Worse than the 'no treatment' statistics, estimating 1% prevalence, there are roughly 3.3million people w schizophrenia in this country. Per this article only 25% even have health insurance, never mind treatment!
    James C Beck, MD PhD, Prof of Psychiatry Emeritus, HMS
    CONFLICT OF INTEREST: None Reported
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