JOURNAL ARTICLE

Epidemiology of acute rheumatic fever in New Zealand 1996-2005

Richard Jaine, Michael Baker, Kamalesh Venugopal
Journal of Paediatrics and Child Health 2008, 44 (10): 564-71
19012628

AIM: Acute rheumatic fever (ARF) and its sequela chronic rheumatic heart disease remain significant causes of morbidity and mortality in New Zealand, particularly among Māori and Pacific peoples. Despite its importance, ARF epidemiology has not been reviewed recently. The aims of this study were to assess trends in ARF incidence rates between 1996 and 2005 and the extent to which ARF is concentrated in certain populations based on age, sex, ethnicity and geographical location.

METHODS: This descriptive epidemiological study examined ARF incidence rates using hospitalisation data (1996-2005) and population data from the 1996 and 2001 censuses. Rates were compared by using rate ratios and 95% confidence intervals.

RESULTS: New Zealand's annual ARF rate was 3.4 per 100,000. ARF was concentrated in certain populations: 5- to 14-year-olds, Māori and Pacific peoples and upper North Island areas. From 1996 to 2005, the New Zealand European and Others ARF rate decreased significantly while Māori and Pacific peoples' rates increased. Compared with New Zealand European and Others, rate ratios were 10.0 for Māori and 20.7 for Pacific peoples. Of all cases, 59.5% were Māori or Pacific children aged 5-14 years, yet this group comprised only 4.7% of the New Zealand population.

CONCLUSION: ARF rates in New Zealand have failed to decrease since the 1980s and remain some of the highest reported in a developed country. There are large, and now widening, ethnic disparities in ARF incidence. ARF is so concentrated by age group, ethnicity and geographical area that highly targeted interventions could be considered, based on these characteristics.

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