{"doi":"10.15585/mmwr.mm7137a4","title":"Mortality Risk Among Patients Hospitalized Primarily for COVID-19 During the Omicron and Delta Variant Pandemic Periods — United States, April 2020–June 2022","abstract":null,"journal":"MMWR. 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Boehmer","orcid":"0000-0002-3328-9555","position":11,"is_corresponding":false},{"id":843301,"name":"Stacey Adjei","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Mortality Risk Among Patients Hospitalized Primarily for COVID-19 During the Omicron and Delta Variant Pandemic Periods — United States, April 2020–June 2022","abstract":"The risk for COVID-19-associated mortality increases with age, disability, and underlying medical conditions (1). Early in the emergence of the Omicron variant of SARS-CoV-2, the virus that causes COVID-19, mortality among hospitalized COVID-19 patients was lower than that during previous pandemic peaks (2-5), and some health authorities reported that a substantial proportion of COVID-19 hospitalizations were not primarily for COVID-19-related illness,* which might account for the lower mortality among hospitalized patients. Using a large hospital administrative database, CDC assessed in-hospital mortality risk overall and by demographic and clinical characteristics during the Delta (July-October 2021), early Omicron (January-March 2022), and later Omicron (April-June 2022) variant periods among patients hospitalized primarily for COVID-19. Model-estimated adjusted mortality risk differences (aMRDs) (measures of absolute risk) and adjusted mortality risk ratios (aMRRs) (measures of relative risk) for in-hospital death were calculated comparing the early and later Omicron periods with the Delta period. Crude mortality risk (cMR) (deaths per 100 patients hospitalized primarily for COVID-19) was lower during the early Omicron (13.1) and later Omicron (4.9) periods than during the Delta (15.1) period (p<0.001). Adjusted mortality risk was lower during the Omicron periods than during the Delta period * Examples include New York (https://www.wivb.com/news/new-york/new-yorkstate-covid-19-update-saturday-january-22/); Massachusetts (https://www. boston.com/news/coronavirus/2022/01/21/almost-half-of-mass-covidhospitalizations-are-now-classified-as-incidental-heres-what-that-means/); Marin County, California (https://coronavirus.marinhhs.org/ surveillance#keyindicators); and various health systems in Florida, Maryland, and Texas (https://www.nytimes.com/2022/01/04/health/covid-omicronhospitalizations.html).","is_dataset_classified":null,"base_score":5.298317366548036,"endowment":5.298317366548036,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"36107788","pmcid":"PMC9484808","openalex_id":"https://openalex.org/W4295899573","authors":[],"funders":[],"total_grants":0,"fwci":17.483,"citation_percentile":0.99517356,"influential_citations":0,"citation_trend":[{"year":2022,"count":10},{"year":2023,"count":92},{"year":2024,"count":57},{"year":2025,"count":25},{"year":2026,"count":15}],"oa_status":"gold","license":"public-domain","oa_locations":[{"url":"https://www.cdc.gov/mmwr/volumes/71/wr/pdfs/mm7137a4-H.pdf","host_type":"journal"},{"url":"https://www.cdc.gov/mmwr/volumes/71/wr/pdfs/mm7137a4-H.pdf","host_type":"publisher"},{"url":"https://doi.org/10.15585/mmwr.mm7137a4","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/36107788","host_type":"repository"},{"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/9484808","host_type":"repository"},{"url":"https://europepmc.org/articles/PMC9484808","host_type":"Europe_PMC"},{"url":"https://europepmc.org/articles/PMC9484808?pdf=render","host_type":"Europe_PMC"}],"fields_of_study":["COVID-19 and healthcare impacts","COVID-19 Clinical Research Studies","SARS-CoV-2 and COVID-19 Research"],"mesh_terms":["COVID-19","SARS-CoV-2","Adolescent","Adult","Female","Hospitalization","Humans","Male","United States","Hospital Mortality","Pandemics"],"keywords":["Medicine","Coronavirus disease 2019 (COVID-19)","Pandemic","Demography","Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)","Pediatrics","Delta","2019-20 coronavirus outbreak","Internal medicine","Disease","Virology","Outbreak"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Good health and well-being"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-09T04:33:55.444491Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}