Andria Apostolou is with the Division of Epidemiology and Disease Prevention, Indian Health Service, Rockville, MD, and is also with SciMetrika LLC, Research Triangle, NC. Christina Chapman and Marissa Person are with the Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA. Kristen Kreisel is with Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention. Jeffrey McCollum is with Division of Epidemiology and Disease Prevention, Indian Health Service.
To describe trends in rates of pelvic inflammatory disease (PID) encounters among American Indian/Alaska Native (AI/AN) women aged 15 to 44 years in the United States receiving care within the Indian Health Service (IHS).
We analyzed IHS discharge data sets for PID encounters during 2001 to 2015 with International Classification of Diseases, Ninth Revision, Clinical Modification, diagnosis codes. We calculated rates of PID encounters per 100?000 women overall and stratified by age group, region, and health care setting. We used regression to identify trends in the total, annual, and average annual percent changes in the rate of PID encounters.
There were 44?042 PID encounters during 2001 to 2015 (rate?=?825 per 100?000). The highest rates were among women aged 20 to 24 years (1104) and from the Alaska region (1556). Rates significantly decreased overall (2001: 1084; 2015: 512; P?