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Scope and limitations of registerbased research
Nordic Vaccine Meeting 2014
23rd –25th April in Bergen, Norway
Lill Trogstad, MD, PhD Norwegian Institute of Public Health
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Nasjonalt vaksinasjonsregister, The
Norwgian immunisation reSYSVAK
• National electronic immunisation register, SYSVAK since 1995
– Pilot project 1976 in 5 counties
– Legally based in the SYSVAK-regulation since 2003
– Contains approximately 27 mill. vaccinations for 3,5 mill. persons
– Based on personal identification numbers
The Norwegian immunisation
register- SYSVAK
Trogstad L, Ung G, Hagerup-Jenssen M, Cappelen I, Haugen I, Feiring B. The
Norwegian immunisation register – SYSVAK. Euro Surveill 012;17(16):pii=20147.
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Notification requirements
• All childhood immunisations – Compulsory
• During 2009/2010 pandemic: – All H1N1 vaccinations in children and adults
(approximately 2 mill. vaccinations)
– Compulsory
• Since January 2011: – All vaccinations also in adults included
– Oral consent by vaccinee
• Approximately 1 mill. notifications/ year
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Vaccine registries – utilisation
• Administrative purposes
• Keep track of vaccinations
– Health care personnel’
– Public ‘My vaccines’
• Descriptive studies
• Analytic studies 4
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Descriptive studies
• Vaccination coverage
– Time trends
– Geographical variation
– Number of doses (adherence to schedule)
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Examples - descriptive studies
Time series. Proportion of 2-year olds vaccinated in Norway
2000-2013.
http://www.fhi.no/artikler/?id=84900 6
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Vaccine coverage (%) MMR, 2013. National data (SYSVAK)
Age Year Measles, mumps,
rubella
2 year olds 2013 93
9 year olds 2013 95
16 year olds 2013 94
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Examples
- descriptive studies
MMR vaccine coverage (%) in 16-year olds, 2013
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Analytic studies
Exposure Vaccination Outcome
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Analytic studies
• Exposures- examples
– Socioeconomic factors
– Chronic diseases
• Outcomes – examples
– Vaccine effectiveness
– Disease burden
– Sero-prevalence/ genotype
alterations
– Adverse events
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Vaccination registries -linkage possibilities for exposures and outcomes
• Other registries
• Cohort studies
• Cross-sectional studies
• Case-control studies
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1. Cause of death registry (personid) 1925/1951
2. Medical Birth Registry (personid) 1967
3. Heart/ coronary disease registry (personid) 2010
4. Reporting system for communicable diseases (MSIS) (personid)
1977
5. TB-registry (personid)
1962
6. Norwegian immunisation register (SYSVAK) (personid) 1995
7. Surveillance system for antibiotic resistance in microbes (NORM) (anonymous)
2003
8. Surveillance system for nosocomial infections (NOIS) (anonymisert) 2005
9. Norwegian prescription database (NorPD)(pseudonymt)
2004
10. Abortion registry (non-identifiable)
1979/2007
11. Norwegian Cancer Registry (personid) 1952
12. Norwegian Patient Registrys (NPR) (personid) 2007
National health registers, Norway
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Vaccination registries
-linkage possibilities for exposures and outcomes
Exposure Exposure
• Population register
• Sosioeconomic register
Vaccination Vaccination
• Vaccination register
Outcomes Outcomes
• Patient register
• Birth register
• Infection register
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Vaccination registries
-linkage possibilities for exposures and outcomes
Exposure
• Cohort study
Vaccination
• Vaccination register
Outcomes
• Cohort study
• Case-control study
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See
poster 15
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Examples - analytic studies
Håberg SE et al. N Engl J Med 2013. DOI: 10.1056/NEJMoa1207210.
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Does H1N1 immunisation or infection
cause fetal death?
Exposures Exposures
• Population Registry
• Medical Birth Registry
• Eligible pregnancies
Vaccination and infection Vaccination and infection
• Immunsation Registry
• Vaccination status
• Date of vaccination
• Primary-care data
• Influenza (R80)
• Infection register
• Positive H1N1 tests
Outcomes Outcomes
• Medical Birth Registry
• Fetal death
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Temporal Distribution of Vaccination and Laboratory-Confirmed Pandemic Influenza.
Håberg SE et al. N Engl J Med 2013. DOI: 10.1056/NEJMoa1207210
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Results (1)
• Vaccination during pregnancy not associated with
increased risk of fetal death
– HR: 0.88 (0.66 – 1.17)
• Vaccinated women had reduced risk of influenza
– HR: 0.30 (0.25 – 0.34)
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Results (2)
• Women who were pregnant during the main
pandemic wave had increased risk of fetal death
– HR: 1.26 (1.02 – 1.55)
• Women with a influenza diagnosis had nearly
doubled risk of fetal death
– HR: 1.91 (1.07 – 3.41)
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Is Chronic Fatigue Syndrome/ Myalgic Encephalo-
myelitis (CFS/ME) linked to H1N1 infection or
immunisation ?
Exposure
• Population Registry
• Age
• Sex
Vaccination or infection
• Immunsation Registry
• Vaccination status
• Date of vaccination
• Primary-care data
• Influenza (R80)
• Infection register
• Positive H1N1 tests
Outcomes
• National Patient Register
• CFS/ ME
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Results Table 3. Cumulative incidence of CFS/ME for the years 2010-2012, and
relative risks according to the joint distribution of vaccination and
influenza infection
Vacc Inf#
No of
Subjects
No of
cases
Cum
Incidence *
RR 95 %
CI
No No 2858459 2086 73.0 1 (reference)
Yes No 1804947 1316 72.9 1.00
No Yes 79625 159 200.0 2.74
Yes Yes 36934 63 170.6 2.34
#as reported from primary health care and from microbiology laboratories
*proportion: number of cases per 100,000 subjects 22
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Conclusions
• Pandemic influenza A (H1N1) infection
appears to more than double the risk of
CFS/ME
• Immunisation with an inactivated,
adjuvanted influenza vaccine does not
increase the risk
Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is linked to pandemic
influenza infection, but not to vaccination. Magnus et al. In prep 2014
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Limitations of registry based
research
• Incomplete notification
– Legal basis
– Technical issues
– Willingness (ability)to notify
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Limitations for analytic studies
• Legal basis
• Opinions of ethical committees
• Completeness and quality of data
• Time and costs
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Prospects
• Increase use of linked registerdata and
analytic methods in the vaccine field in
Norway
• Research purposes
• Systematic surveillance
• Enhance Nordic collaboration for register -
based analyses of rare outcomes
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Thank you
Easter in Southern Norway 2014
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