Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review

Toy M, Önder FO, Wörmann T, Bozdayi AM, Schalm SW, Borsboom GJ, van Rosmalen J, Richardus JH, Yurdaydin C (2011)
BMC infectious diseases 11(1).

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Abstract
BACKGROUND: To provide a clear picture of the current hepatitis B situation, the authors performed a systematic review to estimate the age- and region-specific prevalence of chronic hepatitis B (CHB) in Turkey. METHODS: A total of 339 studies with original data on the prevalence of hepatitis B surface antigen (HBsAg) in Turkey and published between 1999 and 2009 were identified through a search of electronic databases, by reviewing citations, and by writing to authors. After a critical assessment, the authors included 129 studies, divided into categories: 'age-specific'; 'region-specific'; and 'specific population group'. To account for the differences among the studies, a generalized linear mixed model was used to estimate the overall prevalence across all age groups and regions. For specific population groups, the authors calculated the weighted mean prevalence. RESULTS: The estimated overall population prevalence was 4.57, 95% confidence interval (CI): 3.58, 5.76, and the estimated total number of CHB cases was about 3.3 million. The outcomes of the age-specific groups varied from 2.84, (95% CI: 2.60, 3.10) for the 0-14-year olds to 6.36 (95% CI: 5.83, 6.90) in the 25-34-year-old group. CONCLUSION: There are large age-group and regional differences in CHB prevalence in Turkey, where CHB remains a serious health problem.
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Toy M, Önder FO, Wörmann T, et al. Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review. BMC infectious diseases. 2011;11(1).
Toy, M., Önder, F. O., Wörmann, T., Bozdayi, A. M., Schalm, S. W., Borsboom, G. J., van Rosmalen, J., et al. (2011). Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review. BMC infectious diseases, 11(1).
Toy, M., Önder, F. O., Wörmann, T., Bozdayi, A. M., Schalm, S. W., Borsboom, G. J., van Rosmalen, J., Richardus, J. H., and Yurdaydin, C. (2011). Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review. BMC infectious diseases 11.
Toy, M., et al., 2011. Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review. BMC infectious diseases, 11(1).
M. Toy, et al., “Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review”, BMC infectious diseases, vol. 11, 2011.
Toy, M., Önder, F.O., Wörmann, T., Bozdayi, A.M., Schalm, S.W., Borsboom, G.J., van Rosmalen, J., Richardus, J.H., Yurdaydin, C.: Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review. BMC infectious diseases. 11, (2011).
Toy, Mehlika, Önder, Fatih Oguz, Wörmann, Tanja, Bozdayi, A Mithat, Schalm, Solko W, Borsboom, Gerard J, van Rosmalen, Joost, Richardus, Jan Hendrik, and Yurdaydin, Cihan. “Age- and region-specific hepatitis B prevalence in Turkey estimated using generalized linear mixed models: a systematic review”. BMC infectious diseases 11.1 (2011).
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