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Respiratory Syncytial Virus (RSV)NCT05622331

Burden of Respiratory Syncytial Virus (RSV) in Children in Sweden (BRICS): A Retrospective Study in Sweden

An observational study of Respiratory Syncytial Virus (RSV), run by Sanofi Pasteur, a Sanofi Company.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Primary Objective: -Estimate the hospital-associated healthcare resource use (HCRU), and associated costs, of RSV infection in children in comparison to the non-RSV control cohort (general population) and patients with rhinovirus infection. Read more about this study

Who is it for?
Ages Up to 5 years
Conditions the study is for
Respiratory Syncytial Virus (RSV)
How many people
1,100,000 participants
Where
No sites listed yet
Study dates
1 Jul 2006to 19 Apr 2024
Phase
Observational
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages Up to 5 years
  • All sexes
  • No healthy volunteers
  • Child

Study population: The source population for this study will consist of all children (≤5 years of age) in Sweden with an RSV infection or any acute respiratory infection (ARI) between January 1rst 2001 and latest available date, identified from three sources: * Primary or secondary diagnosis in hospital care (National Patient Registry) * Primary or secondary diagnosis in primary care (regional databases) * Positive RSV laboratory test result (Regional laboratory data) The expected study sample is 38,000 unique pediatric patients with an RSV diagnosis, identified in the National Patient Register between 2001 and 2020. The expected RSV sample size, the non-RSV control population will consist of 80,000-160,000 individuals, matched 1:10. The expected number of ARI infections during the time period is estimated to around 1 million. This totals a study sample of between 1-1.1 million.

Who may be able to join

  • •Children (≤5 years of age) with an RSV infection or any acute respiratory infection (ARI) between July 1st 2001 and latest available date, identified in either hospital care, regional primary care or laboratory database.

Who cannot join

  • •There are no exclusion criteria for this study.

About this study

Primary Objective:

-Estimate the hospital-associated healthcare resource use (HCRU), and associated costs, of RSV infection in children in comparison to the non-RSV control cohort (general population) and patients with rhinovirus infection.

Read more

Secondary Objectives:

  • Describe demographic and clinical patient characteristics of RSV infected children.
  • Estimate and compare the incidence of RSV infection and acute respiratory infections (ARIs) in children.
  • Estimate the mortality associated with RSV infection in children.
  • Estimate the social economic burden of RSV infection in children in relation to parents staying home from work to care for their sick child (VAB leave) in comparison to non-RSV control cohort (i.e. parents to children in the general population).
  • Estimate the net days with VAB leave and the compensation disbursed (temporary parental benefit) associated with RSV infection in children.
  • Estimate the indirect costs that can be attributed to VAB leave.
  • Examine the medium- and long-term complications associated with an RSV diagnosis in children in comparison to the non-RSV control chart (general population) and patients with rhinovirus infection.
  • Examine and describe risk factors associated with an RSV infection in children
  • Estimate the healthcare resource use (HCRU), and associated costs, of RSV infection in children, for a subset of patients where primary care data is available, in comparison to the non-RSV control cohort (general population).
Read the detailed description

The overall study period will be between July 1st 2001 and to latest available date (likely June 30th 2022).

Patients will be identified for inclusion in the study population between July 1st 2006 and June 30th 2021.

Patients will be followed from time of inclusion until end of the study period or until death.

All patients will have an index date corresponding to the date of diagnosis of incident infection in primary and/or hospital care during the identification period. An incident infection is defined as the occurrence of infections more than 30 (>30) days apart. This implies that a patient can have more than one index date during the study period. Patients that are included in both the RSV cohort and the regional primary care RSV cohort may have two different index dates for the same incident infection, depending on the objective. This is if a patient is first treated in primary care and then hospitalized. The index date is defined differently for the two cohorts, as the first diagnosis in hospital care for the RSV cohort and first diagnosis in primary care OR hospital care for the regional primary care cohort. The non-RSV controls will have the same index date as their matched RSV patient.

The look-back period will be used to inform baseline characteristics as well as patients' medical and diagnosis history. All patients will have possible look-back from birth for information on the patient's hospital care history and from 2005 for information on the patient's prescribed drugs history. The individual look-back and follow-up will depend on the time of inclusion in the study population as well as age at inclusion.

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

Study groups in NCT05622331
Study groupRoleWhat they receive
RSV cohortChildren (<5 years of age at diagnosis) with a diagnosis of RSV (ICD-10 code) in hospital care between July 1st 2006 and June 30th 2021
Regional primary care RSV cohortChildren (<5 year of age) with a diagnosis of RSV (ICD-10 code) in primary care identified in regional databases (Region Skåne, Region Halland and VGR) between July 1st 2006 and June 30th 2021
Regional laboratory RSV cohortChildren (<5 years of age) with a positive laboratory RSV test result (multiplex/rapid PCR, antigen, immunofluorescence or immunochromatography rapid test) in primary or hospital care, identified in regional laboratory databases (Region Skåne and Region Halland) between July 1st 2006 and June 30th 2021
Acute Respiratory Infections (ARI) cohortChildren (<5 of age) with a diagnosis of ARI (ICD-10 code,) in hospital care between July 1st 2006 and June 30th 2021
Regional ARI cohortChildren (<5 years of age) with a diagnosis of RSV (ICD-10 code, see Table 1) in primary care, identified in regional databases (Region Skåne, Region Halland and VGR)
Rhinovirus cohortChildren (<5 of age) with a diagnosis of rhinovirus (ICD-10 code,) in hospital care between July 1st 2006 and June 30th 2021
Human Metapneumovirus (HMPV) cohortChildren (<5 of age) with a diagnosis of HMPV (ICD-10 code,) in hospital care between July 1st 2006 and June 30th 2021
Parainfluenza cohortChildren (<5 of age) with a diagnosis of parainfluenza (ICD-10 code,) in hospital care between July 1st 2006 and June 30th 2021
Parent cohortParents to all children will be linked to the study population, which is possible through linkage between children and parents by their personal identifiers
Non-RSV control cohortA non-RSV control population consisting of children (<5 years of age) will be extracted to estimate the burden compared to the general population

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Short-term healthcare: Number of specialist outpatient visits

    Number of RSV specialist outpatient hospital visits during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  2. Short-term healthcare: Number of hospitalizations

    Number of hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  3. Short-term healthcare: Length of hospitalizations

    The length of hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  4. Short-term healthcare: Number of Intensive Care Unit (ICU) hospitalizations

    Number of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  5. Short-term healthcare: Length of ICU hospitalizations

    The length of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  6. Short-term healthcare: Number of RSV-related medical/surgical procedures

    Number of RSV-related medical/surgical procedures during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  7. Short-term healthcare: Number of dispensed prescriptions of RSV-related medications

    Number of dispensed prescriptions of RSV-related medications during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  8. Short-term healthcare: The costs of direct medical (in- and outpatient care)

    Direct medical (in- and outpatient care) costs related to RSV infection

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  9. Short-term healthcare: The costs of RSV-related medications

    The costs of dispensed prescriptions of RSV-related medications based on pharmacy retail price

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  10. Medium-term healthcare: Number of specialist outpatient visits

    Number of RSV specialist outpatient hospital visits during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  11. Medium-term healthcare: Number of hospitalizations

    Number of hospitalizations/stays related to RSV during follow up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  12. Medium-term healthcare: Length of hospitalizations

    The length of hospitalizations/stays related to RSV during follow up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  13. Medium-term healthcare: Number of Intensive Care Unit (ICU) hospitalizations

    Number of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  14. Medium-term healthcare: Length of ICU hospitalizations

    The length of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  15. Medium-term healthcare: Number of RSV-related medical/surgical procedures

    Number of RSV-related medical/surgical procedures during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  16. Medium-term healthcare: Number of dispensed prescriptions of RSV-related medications

    Number of dispensed prescriptions of RSV-related medications during follow-up

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  17. Medium-term healthcare: The costs of direct medical (in- and outpatient care)

    Direct medical (in- and outpatient care) costs related to RSV infection

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  18. Medium-term healthcare: The costs of RSV-related medications

    The costs of dispensed prescriptions of RSV-related medications based on pharmacy retail price

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

Secondary outcomes (24)
  1. Patient characteristics

    Age at diagnosis, sex distribution, region of residence, birth weight, birth height, gestational age, mothers age at birth, high-risk conditions, parent's education, parent's income, household status

    Measured: Analysis period: July 1st 2006 - June 30th 2021 Reporting period: at index date or during look-back period

  2. Incidence of RSV/ARIs

    Incidence of RSV/ARI per 100,000 population

    Measured: Analysis period: July 1st 2006 - June 30th 2021 Reporting period: by respiratory years

  3. Number of laboratory-confirmed RSV cases with RSV diagnosis

    Number of laboratory confirmed RSV cases with RSV diagnosis code (ICD-10)

    Measured: Analysis period: July 1st 2006 - June 30th 2021 Reporting period: at index date or during look-back period

  4. Number of laboratory-confirmed RSV cases with no RSV diagnosis

    Number of laboratory confirmed RSV cases with no RSV diagnosis code (ICD-10)

    Measured: Analysis period: July 1st 2006 - June 30th 2021Reporting period: at index date or during look-back period

  5. Number of diagnosed RSV cases with no RSV laboratory tests conducted

    Number of diagnosed RSV cases (ICD-10) with no laboratory test conducted

    Measured: Analysis period: July 1st 2006 - June 30th 2021 Reporting period: at index date or during look-back period

  6. Mortality

    All-cause 30-day death from index date

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date

  7. Socioeconomic burden: Net days of VAB leave

    Net days of temporary parental leave (VAB) during follow-up period due to child with RSV diagnosis

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  8. Socioeconomic burden: Net VAB leave benefit

    Net temporary parental leave (VAB) benefit during follow-up period due to child with RSV diagnosis

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  9. Socioeconomic burden: Indirect costs of VAB leave due to RSV

    Productivity loss due to RSV-related temporary parental leave during follow-up period, calculated by human capital method and average wage

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 12 months from (first) index date

  10. Proportion of patients that develop respiratory complications (ICD-10 codes)

    Proportion of patients that develop respiratory complications (ICD-10 codes)

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: per year during 5 years from index date

  11. Incidence of RSV per 1000 person-years

    Incidence of RSV per 1000 person-years in RSV, non-RSV control cohorts and rhinovirus cohorts

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: per year during 5 years from index date

  12. Incidence rate ratios (IRR)

    Incidence rate ratios (IRR) in RSV, non-RSV control and rhinovirus cohorts

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: per year during 5 years from index date

  13. Hazard ratios (HR)

    Hazard ratios (HR) in RSV, non-RSV control and rhinovirus cohorts

    Measured: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: per year during 5 years from index date

  14. Estimation of hazard ratio of each risk factor on being diagnosed with RSV

    A Cox proportional hazards regression model will be used to estimate the hazard ratio of each risk factor on being diagnosed with RSV. Predictors for RSV diagnosis presented as hazard ratios, including premature birth, high-risk conditions, APGAR, seasonality, mother's age at birth, number of children in household, birth order, parent's education, parent's income, household status, maternal smoking, mother's BMI

    Measured: Analysis period: July 1st 2006 - July 31st 2021Reporting period: look back period

  15. Primary Care: Number of primary care contacts

    Number of primary care contacts during follow-up period

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  16. Primary Care: Number of specialized outpatient care visits

    Number of specialized outpatient care visits during follow-up period

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  17. Primary Care: Number of hospitalizations

    Number of hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  18. Primary Care: Length of hospitalizations

    Length of hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  19. Primary Care: Number of ICU hospitalizations

    Number of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  20. Primary Care: Length of ICU hospitalizations

    Length of ICU hospitalizations/stays related to RSV during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  21. Primary Care: Number of RSV-related medical/surgical procedures

    Number of RSV-related medical/surgical procedures during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  22. Primary Care: Number of dispensed prescriptions of RSV-related medications

    Number of dispensed prescriptions of RSV-related medications during follow-up

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  23. Primary Care: The costs of direct medical (in- and outpatient care)

    Direct medical (in- and outpatient care) costs related to RSV infection

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

  24. Primary Care: The costs of RSV-related medications

    The costs of dispensed prescriptions of RSV-related medications based on pharmacy retail price

    Measured: Analysis period: Date of first available data - July 31st 2021 Reporting period: 30 days from index date

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted18 Nov 2022
  2. Study start1 Jul 2006
  3. Primary completion19 Apr 2024
  4. Study completion19 Apr 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Retrospective
Enrolment
1,100,000 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05622331
Sponsor's protocol ID
RSV00046
Other IDs
U1111-1280-4878
Status last verified
May 2024
First submitted
28 Oct 2022
Last updated
14 May 2024
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org

Questions about this trial

What is this clinical trial studying?

An observational study of Respiratory Syncytial Virus (RSV), run by Sanofi Pasteur, a Sanofi Company.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 14 May 2024. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Short-term healthcare: Number of specialist outpatient visits (time frame: Analysis period: July 1st 2006 - July 31st 2021 Reporting period: 30 days from index date). The study lists 18 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 May 2024.

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