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Population-Based Study of Chlamydial Infection in China
A Hidden Epidemic
William L. Parish, PhD;
Edward O. Laumann, PhD;
Myron S. Cohen, MD;
Suiming Pan, MA;
Heyi Zheng, MD;
Irving Hoffman, MPH;
Tianfu Wang, MS;
Kwai Hang Ng, MA
JAMA. 2003;289:1265-1273.
Context Sexually transmitted diseases are increasing rapidly in China. Surveillance data imperfectly indicate current prevalence and risk factors.
Objectives To estimate the prevalence of genital chlamydial and gonococcal infections and to describe patterns of infection by subgroup and behavioral patterns.
Design, Setting, and Participants A national stratified probability sample of 3426 Chinese individuals (1738 women and 1688 men) aged 20 to 64 years, who were interviewed between August 1999 and August 2000, completed a computer-administered survey, and provided a urine specimen (69% total participation rate).
Main Outcome Measure Positive test result for chlamydial or gonococcal infections.
Results The overall prevalence per 100 population of chlamydial infection was 2.6 (95% confidence interval [CI], 1.6-4.1) for women and 2.1 (95% CI, 1.3-3.3) for men. For gonococcal infection, the overall prevalence per 100 population was 0.08 (95% CI, 0.02-0.4) for women and 0.02 (95% CI, 0.005-0.1) for men. Risk factors for chlamydial infection among men aged 20 to 44 years were unprotected sex with a commercial sex worker (odds ratio [OR], 8.24; 95% CI, 3.51-19.35), less education (OR, 7.20; 95% CI, 2.31-22.37), and recent sex with their spouse or other steady partner (OR, 7.73; 95% CI, 2.70-22.10). Among women aged 20 to 44 years, risk factors for chlamydial infection were having less education (OR, 2.82; 95% CI, 1.01-7.91) and living in a city (OR, 3.46; 95% CI, 1.67-7.18) or along the southern coast (OR, 2.16; 95% CI, 1.29-3.63) and having a spouse or other steady sexual partner who earned a high income (OR, 2.85; 95% CI, 1.11-7.29), who socialized often (OR, 2.79; 95% CI, 1.08-7.19), or who traveled less than 1 week per year (OR, 5.40; 95% CI, 1.44-20.3).
Conclusions The prevalence of chlamydial infection in China is substantial. The patterns of infection suggest potential avenues for intervention.
Author Affiliations: Population Research Center, National Opinion Research Center (NORC)/University of Chicago, Chicago, Ill (Drs Parish and Laumann and Messrs Wang and Ng); Division of Infectious Diseases, University of North Carolina, Chapel Hill (Dr Cohen and Mr Hoffman); Sociology of Sexuality Institute, Renmin University, Beijing, China (Mr Pan); and Dermatology/Venerology Division, Peking Union Medical College, Beijing, China (Dr Zheng).
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