The Kaiser Permanente Division of Research conducts, publishes, and disseminates epidemiologic and health services research to improve the health and medical care of Kaiser Permanente members and society at large. We seek to understand the determinants of illness and well-being, and to improve the quality and cost-effectiveness of health care. Currently, DOR’s 600-plus staff is working on more than 580 epidemiological and health services research projects.

three women walking

Breast Density Linked to Increased Risk of Subsequent Breast Cancer

Oakland, CA  - Researchers at Kaiser Permanente have found that patients with a very early form of breast cancer (ductal carcinoma in situ or DCIS) who have higher mammographic density may be at increased risk for subsequent breast cancer, especially in…

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Patient-provider Language Barriers Linked to Worse Diabetes Control

Patients who cannot talk about their diabetes with their doctor in their own language may have poorer diabetes outcomes, even when interpreter services are available, according to a new study by researchers at UCSF and the Kaiser Permanente Division of…

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Physical Limitations Take a Significant Toll in Breast Cancer Survivors

Basic physical limitations following breast cancer treatment can have far-reaching consequences that substantially affect how long a patient lives. According to a new study published online in the Journal of the National Cancer Institute, breast cancer survivors with functional limitations…

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Medical facility

Uniform, National Measures Should Define HIV and AIDS Care

OAKLAND, Calif. – To improve the quality of HIV care and treatment nationwide, 17 measures such as screening and prevention for infections and monitoring of antiretroviral therapy should be adopted uniformly, according a work group led by a Kaiser Permanente…

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woman and femail doctor

New Research Finds Girls Are Starting Puberty Early

Oakland, Calif. (August 9, 2010) -- Girls are starting puberty early, according to new research from the Breast Cancer and the Environment Research Centers (BCERCs). More girls are experiencing the onset of breast development at age 7 and 8, compared…

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child reading

Combination MMRV Vaccine Associated with Two-Fold Risk of Febrile Seizures Compared with Separate MMR & Varicella Vaccines

Electronic Health Records Study of 459,000 Children Sparked New CDC Recommendations Oakland, Calif. – The combination vaccine for measles, mumps, rubella and chickenpox (MMRV) is associated with double the risk of febrile seizures for 1- to 2-year-old children compared with…

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Man and woman visiting doctor

Heart Attacks Declined 24 Percent in Kaiser Permanente Northern California Since 2000

Study of 46,000 Patients Shows More Serious Heart Attacks Also Declined By Much More Video Oakland, Calif. – Heart attacks declined by 24 percent within a large, ethnically diverse, community-based population since 2000, and the relative incidence of serious heart…

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two seniors

Limited Health Literacy Increases Safety Risks for Patients with Diabetes

People with diabetes who have limited health literacy are at higher risk for hypoglycemia or low blood sugar, according to a new study from researchers at the University of California, San Francisco and the Kaiser Permanente Division of Research in…

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Two prescription bottles

Medications that Reduce the Production of Stomach Acid May Increase Hip Fractures

Oakland, CA – Commonly used medications for decreasing stomach acid are associated with an increased risk of hip fracture, according to Kaiser Permanente Researchers. The study, the first major evaluation of this question in the United States and the largest…

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Woman pouring coffee

Coffee Drinking and Caffeine Associated with Reduced Risk of Hospitalization for Heart Rhythm Disturbances

While it is not proven that coffee is protective, it is unlikely that moderate caffeine intake increases arrhythmia risk, Kaiser Permanente study finds SAN FRANCISCO — Coffee drinkers may be less likely to be hospitalized for heart rhythm disturbances, according…

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