Chlamydia trachomatis Trends in Finland (1983–2003)
Author Information
Author(s): Erika Lyytikäinen, Marjo Kaasila, Eija Hiltunen-Back, Matti Lehtinen, Kaisa Tasanen, Heljä-Marja Surcel, Pentti Koskela, Jorma Paavonen
Primary Institution: National Public Health Institute, Oulu and Helsinki, Finland
Hypothesis
What are the trends in incidence and prevalence of Chlamydia trachomatis infections in Finland over the past 20 years?
Conclusion
Chlamydia trachomatis seroprevalence decreased from 1983 to 2003 among fertile-aged women in Finland, while incidence rates based on seroconversions and laboratory notifications increased.
Supporting Evidence
- C. trachomatis seroprevalence rates decreased significantly from 23.3% to 9.2% in women under 23 years of age.
- Seroconversion rates increased from 31 to 97 per 10,000 person years among older women.
- The incidence based on seroconversions was in agreement with reported incidence rates.
Takeaway
The study looked at how many women in Finland had Chlamydia over 20 years. It found that while fewer women had antibodies showing past infections, more were getting new infections.
Methodology
The study analyzed seroprevalence and incidence rates of Chlamydia trachomatis using a random sample of women from the Finnish Maternity Cohort and compared it with laboratory notifications.
Potential Biases
Potential bias due to reliance on laboratory notifications and the exclusion of certain demographics from the serum bank.
Limitations
The study may not fully represent the incidence in adolescents and infertile women, and the data relies on reported cases which may be underreported.
Participant Demographics
Women with two consecutive pregnancies within five years, primarily aged under 29.
Statistical Information
P-Value
p < 0.001
Confidence Interval
95% CI 1.1–8.7
Statistical Significance
p < 0.001
Digital Object Identifier (DOI)
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