Reference health
Key Secular Trends During Three Waves of the COVID-19 Pandemic
11/11 checkable references clean · checked 2026-07-23
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
16 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 11 checked references that resolve
resolves10.1001/jama.2020.2648
Characteristics of and Important Lessons From the Coronavirus Disease 2019 (COVID-19) Outbreak in China
resolves10.12788/jhm.3539
Analysis of Hospital Resource Availability and COVID‐19 Mortality Across the United States
resolves10.1097/MLR.0b013e31819432e5
A Modification of the Elixhauser Comorbidity Measures Into a Point System for Hospital Death Using Administrative Data
resolves10.1016/S1473-3099(20)30483-7
A minimal common outcome measure set for COVID-19 clinical research
resolves10.1371/journal.pone.0254809
The impact of race and ethnicity on outcomes in 19,584 adults hospitalized with COVID-19
resolves10.1186/s12873-015-0049-y
Assessing the association between occupancy and outcome in critically Ill hospitalized patients with sepsis
resolves10.1016/S0140-6736(15)60355-5
Delay to admission to critical care and mortality among deteriorating ward patients in UK hospitals: a multicentre, prospective, observational cohort study
resolves10.1503/cmaj.211248
Evaluation of the relative virulence of novel SARS-CoV-2 variants: a retrospective cohort study in Ontario, Canada
resolves10.15585/mmwr.mm7043e1
Severity of Disease Among Adults Hospitalized with Laboratory-Confirmed COVID-19 Before and During the Period of SARS-CoV-2 B.1.617.2 (Delta) Predominance — COVID-NET, 14 States, January–August 2021
The 16 references without a DOI — listed, not checked
no DOI — not checkedref1
no DOI — not checkedFactors associated with hospital admission and critical illness among 5279 people with coronavirus disease
no DOI — not checkedCoronavirus Disease 2019 Case Surveillance -United States
no DOI — not checkedAssociation of COVID-19-Related Hospital Use and Overall COVID-19 Mortality in the USA
no DOI — not checkedVariation in COVID-19 Mortality Across 117 US Hospitals in High-and Low-Burden Settings
no DOI — not checkedAssociation Between Caseload Surge and COVID-19
no DOI — not checkedTherapeutic Anticoagulation with Heparin in Critically Ill Patients with Covid-19
no DOI — not checkedref12
no DOI — not checkedref14
no DOI — not checkedref15
no DOI — not checkedObesity and Mortality Among Patients Diagnosed With COVID-19: Results From an Integrated Health Care Organization
no DOI — not checkedVariation in US Hospital Mortality Rates for Patients Admitted With COVID-19 During the First 6 Months of the Pandemic
no DOI — not checkedAssociation Between mRNA Vaccination and COVID-19 Hospitalization and Disease Severity
no DOI — not checkedref25
no DOI — not checkedBaricitinib plus Remdesivir for Hospitalized Adults with Covid-19
no DOI — not checkedref27
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work were clean at the dated check: each resolved to a known work in a public registry, and none
carried a retraction notice at that time. It says nothing about the quality, findings,
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