Change From Baseline in Alanine Aminotransferase (ALT)
Blood to evaluate ALT was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The measure was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Aspartate Aminotransferase (AST)
Blood to evaluate AST was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The measure was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in C-reactive Protein (CRP)
Blood to evaluate CRP was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The measure was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Creatinine
Blood to evaluate serum creatinine was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The measure was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in D-dimer Concentration
Blood to evaluate d-dimer concentration was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge.
Change From Baseline in Hemoglobin
Blood to evaluate hemoglobin was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Prothrombin International Normalized Ratio (INR)
Blood to evaluate INR was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Platelets
Blood to evaluate platelets was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed overall and by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Total Bilirubin
Blood to evaluate total bilirubin was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in White Blood Cell Count (WBC)
Blood to evaluate WBC was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Neutrophils
Blood to evaluate neutrophils was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Lymphoctyes
Blood to evaluate lymphocytes was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Monocytes
Blood to evaluate monocytes was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Basophils
Blood to evaluate basophils was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change From Baseline in Eosinophils
Blood to evaluate eosinophils was collected at Days 1, 3, 5, 8, and 11 while participants were inpatient, and at Days 15 and 29, with the Day 1 assessment serving as baseline. Participants who had been discharged had blood collected if infection control measures allowed for in-person visits after discharge. The outcome was assessed by baseline ordinal scale category (categories 4 and 5 versus category 6).
Change in National Early Warning Score (NEWS) From Baseline
The NEW score has demonstrated an ability to discriminate patients at risk of poor outcomes. This score is based on 7 clinical parameters (respiration rate, oxygen saturation, any supplemental oxygen, temperature, systolic blood pressure, heart rate, level of consciousness). The NEW Score is being used as an efficacy measure. The minimum score is 0, representing the better outcome, and the maximum value is 19, representing the worse outcome.
Percentage of Participants Reporting Grade 3 and 4 Clinical and/or Laboratory Adverse Events (AEs)
Grade 3 AEs are defined as events that interrupt usual activities of daily living, or significantly affects clinical status, or may require intensive therapeutic intervention. Severe events are usually incapacitating. Grade 4 AEs are defined as events that are potentially life threatening.
Percentage of Participants Reporting Serious Adverse Events (SAEs)
An SAE is defined as an AE or suspected adverse reaction is considered serious if, in the view of either the investigator or the sponsor, it results in death, a life-threatening AE, inpatient hospitalization or prolongation of existing hospitalization, a persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions, or a congenital anomaly/birth defect.
Duration of Hospitalization
Duration of hospitalization was determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die.
Duration of Invasive Mechanical Ventilation
Duration of invasive ventilation was measured in days among participants who required invasive ventilation, determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die
Duration of New Non-invasive Ventilation or High Flow Oxygen Use
Duration of new non-invasive ventilation or high flow oxygen use was measured in days among participants who were not on non-invasive ventilation or high-flow oxygen use at baseline, determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die
Duration of New Oxygen Use
Duration of new oxygen use was measured in days among participants who were not on oxygen at baseline, determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die
Duration of New Ventilator or Extracorporeal Membrane Oxygenation (ECMO) Use
Duration of new ventilator or ECMO use was measured in days among participants who were not on a ventilator or ECMO at baseline, determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die.
Duration of Non Invasive Ventilation or High Flow Oxygen Use
Duration of non invasive ventilation or high flow oxygen use was measured in days, determined two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die.
Duration of Oxygen Use
Duration of oxygen use was measured in days among participants who were on oxygen in based, calculated in two ways. The first includes imputations for participants who died. The second method is restricted to participants who did not die.
Number of Participants With Discontinuation or Temporary Suspension of Study Product Administration
Discontinuation or temporary suspension of study product administration, including participants who died or were discharged, was evaluated by baseline ordinal scale category (categories 4 and 5 versus category 6).
Proportion of Participants With New Non-invasive Ventilation or High Flow Oxygen Use
Proportion of participants with new non-invasive ventilation or high flow oxygen use was assessed as for participants in Ordinal Score 4 and 5.
Proportion of Participants With New Oxygen Use
Incidence of new oxygen use was assessed as for participants in Ordinal Score 4 and 5 who were not on oxygen at baseline.
Proportion of Participants With New Ventilator or Extracorporeal Membrane Oxygenation (ECMO) Use
Incidence of new ventilator or extracorporeal membrane oxygenation (ECMO) use was assessed among participants not on ventilator or extracorporeal membrane oxygenation (ECMO) use at baseline.
Mean Change From Baseline in the Ordinal Scale
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 1) Not hospitalized, no limitations on activities; 2) Not hospitalized, but new or increased limitation on activities and/or new or increased requirement for home oxygen; 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 5) Hospitalized, requiring supplemental oxygen; 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 8) Death. A positive change indicates a worsening and a negative change is an improvement.
Percentage of Participants at Each Clinical Status Using Ordinal Scale at Day 15 for Participants With Baseline Ordinal Score 4 and 5
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities. Data was imputed using last observation carried forward or worst possible score based on hospitalization status (2 if not hospitalized, 7 if hospitalized) when there was a change in hospitalization status since last score. Deaths were imputed as an 8.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 1
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 3
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 5
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 8
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 11
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 15
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 22
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
Percentage of Participants Reporting Each Severity Rating on an 8 Point Ordinal Scale at Day 29
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities.
14-day Participant Mortality
The mortality rate was determined as the proportion of participants who died by study Day 15. The proportions reported are Kaplan-Meier estimates
28-day Participant Mortality
The mortality rate was determined as the proportion of participants who died by study Day 29. The proportions reported are Kaplan-Meier estimates.
Time to an Improvement of One Category Using an Ordinal Scale
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 8) Death; 7) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 6) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 5) Hospitalized, requiring supplemental oxygen; 4) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 3) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 1) Not hospitalized, no limitations on activities. Time to improvement by at least one category was determined for each participant.
Time to an Improvement of Two Categories Using an Ordinal Scale
The ordinal scale is an assessment of the clinical status at the first assessment of a given study day. The scale is as follows: 1) Death; 2) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 3) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 4) Hospitalized, requiring supplemental oxygen; 5) Hospitalized, not requiring supplemental oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 6) Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 7) Not hospitalized, limitation on activities and/or requiring home oxygen; 8) Not hospitalized, no limitations on activities. Time to improvement by at least two categories was determined for each participant.
Time to Discharge or to a National Early Warning Score (NEWS) of </= 2 and Maintained for 24 Hours, Whichever Occurs First
The NEW score has demonstrated an ability to discriminate patients at risk of poor outcomes. This score is based on 7 clinical parameters (respiration rate, oxygen saturation, any supplemental oxygen, temperature, systolic blood pressure, heart rate, level of consciousness). The NEW Score is being used as an efficacy measure. The minimum score is 0, representing the better outcome, and the maximum value is 19, representing the worse outcome. The time to discharge or a NEWS of less than or equal to 2 was determined for each participant.
Time to Recovery for Patients With a Baseline Ordinal Score of 4 and 5
Day of recovery is defined as the first day on which the subject satisfies one of the following three categories from the ordinal scale: 1) Not hospitalized, no limitations on activities; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 3) Hospitalized, not requiring supplemental oxygen and no longer requires ongoing medical care.