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. 2001 Jan;84(1):24–30. doi: 10.1136/adc.84.1.24

Changes in the epidemiology of sudden infant death syndrome in Sweden 1973-1996

B Alm 1, S Norvenius 1, G Wennergren 1, R Skjarven 1, N Oyen 1, J Milerad 1, M Wennborg 1, J Kjaerbeck 1, K Helweg-Larsen 1, L Irgens 1
PMCID: PMC1718623  PMID: 11124779

Abstract

BACKGROUND—From the early 1970s to the early 1990s, there was a significant rise in the incidence of sudden infant death syndrome (SIDS) in Scandinavia. Following the risk reducing campaign, the incidence has fallen to about the same level as in 1973.
AIMS—To identify the changes that have occurred in the epidemiology of SIDS.
METHODS—We compared the Swedish part of the Nordic Epidemiological SIDS Study (NESS), covering the years 1992-1995, with two earlier, descriptive studies during this period. To assess the changing effects of risk factors, we analysed data from the Medical Birth Registry of Sweden, covering the years 1973-1996.
RESULTS—There was a predominance of deaths during weekends in the 1970s and 1990s. The seasonal variation was most notable in the 1980s. The proportion of young mothers decreased from 14% to 5%. Cohabitation (living with the biological father) was as frequent in the 1990s as in the 1970s. The prevalence of high parity, admissions to neonatal wards, low birth weight, prematurity, and multiple pregnancies were all increased in the 1990s compared to the 1970s. No significant change in the prevalence of previous apparent life threatening events was found. Deaths occurring in cars diminished from 10% to below 2%. In the data from the Medical Birth Registry of Sweden, there were significantly increased odds ratios after the risk reducing campaign of the risk factors smoking during early pregnancy and preterm birth. We could find no increased effects of maternal age, parity, or being small for gestational age over time. The rate of deaths at weekends remained increased; the median age at death fell from 90 to 60 days. Seasonal variation was less notable in the periods of low incidence.


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Selected References

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  1. Alm B., Milerad J., Wennergren G., Skjaerven R., Oyen N., Norvenius G., Daltveit A. K., Helweg-Larsen K., Markestad T., Irgens L. M. A case-control study of smoking and sudden infant death syndrome in the Scandinavian countries, 1992 to 1995. The Nordic Epidemiological SIDS Study. Arch Dis Child. 1998 Apr;78(4):329–334. doi: 10.1136/adc.78.4.329. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Alm B., Norvenius S. G., Wennergren G., Lagercrantz H., Helweg-Larsen K., Irgens L. M. Living conditions in early infancy in Denmark, Norway and Sweden 1992-95: results from the Nordic Epidemiological SIDS study. Acta Paediatr. 2000 Feb;89(2):208–214. doi: 10.1080/080352500750028852. [DOI] [PubMed] [Google Scholar]
  3. Alm B., Wennergren G., Norvenius G., Skjaerven R., Oyen N., Helweg-Larsen K., Lagercrantz H., Irgens L. M. Caffeine and alcohol as risk factors for sudden infant death syndrome. Nordic Epidemiological SIDS Study. Arch Dis Child. 1999 Aug;81(2):107–111. doi: 10.1136/adc.81.2.107. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Andersen F., Forsdahl A. Endring av spedbarnsleie og forekomst av krybbedød i nord-Norge. Tidsskr Nor Laegeforen. 1995 Nov 20;115(28):3515–3517. [PubMed] [Google Scholar]
  5. Cameron A. H., Asher P. Cot deaths in Birmingham 1958-61. Med Sci Law. 1965 Oct;5(4):187–199. doi: 10.1177/002580246500500402. [DOI] [PubMed] [Google Scholar]
  6. Daltveit A. K., Oyen N., Skjaerven R., Irgens L. M. The epidemic of SIDS in Norway 1967-93: changing effects of risk factors. Arch Dis Child. 1997 Jul;77(1):23–27. doi: 10.1136/adc.77.1.23. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Douglas A. S., Helms P. J., Jolliffe I. T. Seasonality of sudden infant death syndrome (SIDS) by age at death. Acta Paediatr. 1998 Oct;87(10):1033–1038. doi: 10.1080/080352598750031338. [DOI] [PubMed] [Google Scholar]
  8. EMERY J. L. Epidemiology of "sudden, unexpected, or rapid" deaths in children. Br Med J. 1959 Nov 7;2(5157):925–928. doi: 10.1136/bmj.2.5157.925. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Engelberts A. C., de Jonge G. A. Choice of sleeping position for infants: possible association with cot death. Arch Dis Child. 1990 Apr;65(4):462–467. doi: 10.1136/adc.65.4.462. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Espehaug B., Daltveit A. K., Vollset S. E., Oyen N., Ericson A., Irgens L. M. Infant survival in Norway and Sweden 1985-88. Acta Paediatr. 1994 Sep;83(9):977–982. doi: 10.1111/j.1651-2227.1994.tb13186.x. [DOI] [PubMed] [Google Scholar]
  11. Fleming P. J., Gilbert R., Azaz Y., Berry P. J., Rudd P. T., Stewart A., Hall E. Interaction between bedding and sleeping position in the sudden infant death syndrome: a population based case-control study. BMJ. 1990 Jul 14;301(6743):85–89. doi: 10.1136/bmj.301.6743.85. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Irgens L. M., Markestad T., Baste V., Schreuder P., Skjaerven R., Oyen N. Sleeping position and sudden infant death syndrome in Norway 1967-91. Arch Dis Child. 1995 Jun;72(6):478–482. doi: 10.1136/adc.72.6.478. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Julious S. A. There is still seasonality in sudden infant death syndrome in England and Wales. J Epidemiol Community Health. 1997 Feb;51(1):101–102. doi: 10.1136/jech.51.1.101. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Kaada B., Sivertsen E. Sudden infant death syndrome during weekends and holidays in Norway in 1967-1985. Scand J Soc Med. 1990;18(1):17–23. doi: 10.1177/140349489001800103. [DOI] [PubMed] [Google Scholar]
  15. Markestad T. Information about sudden infant death syndrome for the general public. Acta Paediatr Suppl. 1993 Jun;82 (Suppl 389):124–125. doi: 10.1111/j.1651-2227.1993.tb12898.x. [DOI] [PubMed] [Google Scholar]
  16. Marsál K., Persson P. H., Larsen T., Lilja H., Selbing A., Sultan B. Intrauterine growth curves based on ultrasonically estimated foetal weights. Acta Paediatr. 1996 Jul;85(7):843–848. doi: 10.1111/j.1651-2227.1996.tb14164.x. [DOI] [PubMed] [Google Scholar]
  17. Mitchell E. A., Scragg R., Stewart A. W., Becroft D. M., Taylor B. J., Ford R. P., Hassall I. B., Barry D. M., Allen E. M., Roberts A. P. Results from the first year of the New Zealand cot death study. N Z Med J. 1991 Feb 27;104(906):71–76. [PubMed] [Google Scholar]
  18. Norvenius S. G. Sudden infant death syndrome in Sweden in 1973-1977 and 1979. Acta Paediatr Scand Suppl. 1987;333:1–138. doi: 10.1111/j.1651-2227.1987.tb17289.x. [DOI] [PubMed] [Google Scholar]
  19. Oyen N., Markestad T., Skaerven R., Irgens L. M., Helweg-Larsen K., Alm B., Norvenius G., Wennergren G. Combined effects of sleeping position and prenatal risk factors in sudden infant death syndrome: the Nordic Epidemiological SIDS Study. Pediatrics. 1997 Oct;100(4):613–621. doi: 10.1542/peds.100.4.613. [DOI] [PubMed] [Google Scholar]
  20. Scragg R., Mitchell E. A., Taylor B. J., Stewart A. W., Ford R. P., Thompson J. M., Allen E. M., Becroft D. M. Bed sharing, smoking, and alcohol in the sudden infant death syndrome. New Zealand Cot Death Study Group. BMJ. 1993 Nov 20;307(6915):1312–1318. doi: 10.1136/bmj.307.6915.1312. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Wennergren G., Alm B., Oyen N., Helweg-Larsen K., Milerad J., Skjaerven R., Norvenius S. G., Lagercrantz H., Wennborg M., Daltveit A. K. The decline in the incidence of SIDS in Scandinavia and its relation to risk-intervention campaigns. Nordic Epidemiological SIDS Study. Acta Paediatr. 1997 Sep;86(9):963–968. doi: 10.1111/j.1651-2227.1997.tb15180.x. [DOI] [PubMed] [Google Scholar]
  22. Wennergren G., Milerad J., Lagercrantz H., Karlberg P., Svenningsen N. W., Sedin G., Andersson D., Grögaard J., Bjure J. The epidemiology of sudden infant death syndrome and attacks of lifelessness in Sweden. Acta Paediatr Scand. 1987 Nov;76(6):898–906. doi: 10.1111/j.1651-2227.1987.tb17261.x. [DOI] [PubMed] [Google Scholar]
  23. Wigfield R., Gilbert R., Fleming P. J. SIDS: risk reduction measures. Early Hum Dev. 1994 Sep 15;38(3):161–164. doi: 10.1016/0378-3782(94)90208-9. [DOI] [PubMed] [Google Scholar]
  24. Williams S. M., Mitchell E. A., Scragg R. Why is sudden infant death syndrome more common at weekends? The New Zealand National Cot Death Study Group. Arch Dis Child. 1997 Nov;77(5):415–419. doi: 10.1136/adc.77.5.415. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. von Sydow G. Plötslig, oväntad spädbarnsdöd. Socialmedicinsk värdering av några fall. Lakartidningen. 1969 Feb 12;66(7):683–689. [PubMed] [Google Scholar]

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