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Association between underweight and hospitalization, emergency room visits, and mortality among patients in community medical homes

Authors Takahashi PY, St Sauver JL, Olson TC, Huber JM, Cha SS, Ebbert JO

Received 6 November 2012

Accepted for publication 6 December 2012

Published 18 January 2013 Volume 2013:6 Pages 1—6

DOI https://doi.org/10.2147/RMHP.S39976

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Paul Y Takahashi.1 Jennifer L St Sauver,2 Timothy C Olson,1 Jill M Huber,1 Stephen S Cha,2 Jon O Ebbert1

1Division of Primary Care Internal Medicine, 2Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA

Background: In older adults, underweight (body mass index [BMI] < 18.5) has been associated with increased mortality. This increased mortality risk may be associated with increased health care utilization. We evaluated the relationship between underweight and hospitalization, emergency room visits, and mortality.
Methods: An analysis of a retrospective cohort study was conducted at a multisite academic primary care medical practice in Minnesota. The patients were ≥60 years of age, impaneled within primary care on January 1, 2011, and had a BMI measurement recorded between January 1, 2011, and December 31, 2011. Individuals were excluded if they refused review of their medical record. The primary measurement was BMI, which was categorized as underweight (BMI < 18.5) or normal and obese (BMI ≥ 18.5). The outcomes were hospitalization, emergency room visits, and mortality in the 2011 calendar year. Associations between underweight and each outcome were calculated using logistic regression. Interactions between underweight and gender were assessed in the logistic regression models. The final results were adjusted for age, gender, comorbid health conditions, and single living status.
Results: The final cohort included 21,019 patients, of whom 220 (1%) were underweight. Underweight patients had a higher likelihood of hospitalization compared with patients with higher BMI (adjusted odds ratio [OR] 1.64; 95% confidence interval [CI] 1.21–2.22). Underweight patients were also more likely to visit the emergency room (adjusted OR 1.70; 95% CI 1.28–2.25) or to die (adjusted OR 3.64; 95% CI 2.33–5.69). Men with a BMI < 18.5 compared with those having a BMI ≥ 18.5 had the highest odds of hospitalization (OR 3.45; 95% CI 1.59–7.48).
Conclusion: Underweight older adults, especially men, have higher odds of hospitalization, emergency room visits, and mortality. Future work on underweight might involve improving weight status, which may reduce the risk of hospitalization, emergency room visits, and mortality.

Keywords:
aging, health care utilization, nutrition, population health

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