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Protective effect of breastfeeding: an ecologic study of Haemophilus influenzae meningitis and breastfeeding in a Swedish population
Department of paediatrics, Örebro medical center hospital, Örebro, Sweden.
Department of occupational and environmental medicine, Unit of biostatistics and epidemiology, Örebro medical center hospital, Örebro, Sweden.
Department of clinical microbiology and immunology, Örebro medical center hospital, Örebro, Sweden.
1999 (engelsk)Inngår i: International Journal of Epidemiology, ISSN 0300-5771, E-ISSN 1464-3685, Vol. 28, nr 1, s. 152-156Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

BACKGROUND: In Orebro County, Sweden, a 2.5-fold increase in the incidence of Haemophilus influenzae (HI) meningitis was found between 1970 and 1980. In a case-control study of possible risk factors for invasive HI infection conducted in the same area, 1987-1992, breastfeeding was found to be a strong protective factor.

MATERIAL AND METHODS: In order to study the relation between incidence rates of HI meningitis between 1956-1992 and breastfeeding rates in the population an ecologic study was performed.

RESULTS: A strong (negative) correlation between breastfeeding and incidence of HI infection 5 to 10 years later (rho(xy) (s) approximately -0.6) was seen, whereas no relation seems to exist for the time lag 15 years and beyond. The correlation for contemporary data was intermediate. There were similar results for the breastfeeding proportions at 2, 4 as well as 6 months of age.

DISCUSSION: Our ecologic data are consistent with results from our case-control study. The time-lag for the delayed effect on the population level could be estimated although sparse data make the estimates vulnerable to sampling fluctuations. Limitations with ecologic studies are discussed.

CONCLUSION: There seems to be an association between high breastfeeding rate in the population and a reduced incidence of HI meningitis 5 to 10 years later. These results do have implications on strategies for breastfeeding promotion, especially in countries where Hib vaccination is too costly and not yet implemented.

sted, utgiver, år, opplag, sider
1999. Vol. 28, nr 1, s. 152-156
Emneord [en]
Haemophilus influenzae infection, breastfeeding, ecologic study
Identifikatorer
URN: urn:nbn:se:umu:diva-36907DOI: 10.1093/ije/28.1.152PubMedID: 10195681OAI: oai:DiVA.org:umu-36907DiVA, id: diva2:356662
Tilgjengelig fra: 2010-10-13 Laget: 2010-10-13 Sist oppdatert: 2018-06-08bibliografisk kontrollert

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