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Original Investigation
January 2018

Association of Cataract Surgery With Mortality in Older WomenFindings from the Women’s Health Initiative

Author Affiliations
  • 1Center for Community Outreach and Policy, Stein Eye Institute, David Geffen School of Medicine, UCLA (University of California, Los Angeles)
  • 2Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance
  • 3Department of Biostatistics, Fielding School of Public Health, UCLA
  • 4Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania
  • 5Department of Medicine (Biostatistics), University of Massachusetts Medical School, Worcester
  • 6Department of Preventive Medicine, University of Tennessee Health Sciences Center, Memphis
  • 7Division of Health Policy and Management, School of Public Health, University of Minnesota, Minneapolis
  • 8Department of Epidemiology, Fielding School of Public Health, UCLA
JAMA Ophthalmol. 2018;136(1):3-10. doi:10.1001/jamaophthalmol.2017.4512
Key Points

Question  How is cataract surgery associated with mortality outcomes in women with cataract?

Findings  In this prospective cohort study of 74 044 participants of the Women's Health Initiative with cataract, cataract surgery was associated with decreased risk for all-cause mortality and mortality attributed to vascular, cancer-related, accidental, neurologic, pulmonary, and infectious causes.

Meaning  In women with cataract, cataract surgery may decrease mortality risk related to multiple types of systemic illness.

Abstract

Importance  Previous studies have suggested an association between cataract surgery and decreased risk for all-cause mortality potentially through a mechanism of improved health status and functional independence, but the association between cataract surgery and cause-specific mortality has not been previously studied and is not well understood.

Objective  To examine the association between cataract surgery and total and cause-specific mortality in older women with cataract.

Design, Setting, and Participants  This prospective cohort study included nationwide data collected from the Women’s Health Initiative (WHI) clinical trial and observational study linked with the Medicare claims database. Participants in the present study were 65 years or older with a diagnosis of cataract in the linked Medicare claims database. The WHI data were collected from January 1, 1993, through December 31, 2015. Data were analyzed for the present study from July 1, 2014, through September 1, 2017.

Exposures  Cataract surgery as determined by Medicare claims codes.

Main Outcomes and Measures  The outcomes of interest included all-cause mortality and mortality attributed to vascular, cancer, accidental, neurologic, pulmonary, and infectious causes. Mortality rates were compared by cataract surgery status using the log-rank test and Cox proportional hazards regression models adjusting for demographics, systemic and ocular comorbidities, smoking, alcohol use, body mass index, and physical activity.

Results  A total of 74 044 women with cataract in the WHI included 41 735 who underwent cataract surgery. Mean (SD) age was 70.5 (4.6) years; the most common ethnicity was white (64 430 [87.0%]), followed by black (5293 [7.1%]) and Hispanic (1723 [2.3%]). The mortality rate was 2.56 per 100 person-years in both groups. In covariate-adjusted Cox models, cataract surgery was associated with lower all-cause mortality (adjusted hazards ratio [AHR], 0.40; 95% CI, 0.39-0.42) as well as lower mortality specific to vascular (AHR, 0.42; 95% CI, 0.39-0.46), cancer (AHR, 0.31; 95% CI, 0.29-0.34), accidental (AHR, 0.44; 95% CI, 0.33-0.58), neurologic (AHR, 0.43; 95% CI, 0.36-0.53), pulmonary (AHR, 0.63; 95% CI, 0.52-0.78), and infectious (AHR, 0.44; 95% CI, 0.36-0.54) diseases.

Conclusions and Relevance  In older women with cataract in the WHI, cataract surgery is associated with lower risk for total and cause-specific mortality, although whether this association is explained by the intervention of cataract surgery is unclear. Further study of the interplay of cataract surgery, systemic disease, and disease-related mortality would be informative for improved patient care.

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