Spatial Distribution & Cluster Analysis of Risky Sexual Behaviours & STDs Reported by Chinese Adults in Guangzhou, China
OBJECTIVES:
To
assess associations between residences location, risky sexual behaviours and
sexually transmitted diseases (STDs) among adults living in Guangzhou, China.
METHODS:
Data were
obtained from 751 Chinese adults aged 18-59 years in Guangzhou, China, using
stratified random sampling by using spatial epidemiological methods.
Face-to-face household interviews were conducted to collect self-report data on
risky sexual behaviours and diagnosed STDs. Kulldorff's spatial scan statistic
was implemented to identify and detect spatial distribution and clusters of
risky sexual behaviours and STDs. The presence and location of statistically
significant clusters were mapped in the study areas using ArcGIS software.
RESULTS:
The
prevalence of self-reported risky sexual behaviours was between 5.1% and 50.0%.
The self-reported lifetime prevalence of diagnosed STDs was 7.06%. Anal
intercourse clustered in an area located along the border within the
rural-urban continuum (p=0.001). High rate clusters for alcohol or other drugs
using before sex (p=0.008) and migrants who lived in Guangzhou <1 year
(p=0.007) overlapped this cluster. Excess cases for unprotected sex (p=0.031)
overlapped the cluster for college students (p<0.001). Five of nine (55.6%)
students who had sexual experience during the last 12 months located in the
cluster of unprotected sex.
CONCLUSIONS:
Short-term
migrants and college students reported greater risky sexual behaviours.
Programmes to increase safer sex within these communities to reduce the risk of
STDs are warranted in Guangzhou. Spatial analysis identified geographical
clusters of risky sexual behaviours, which is critical for optimising
surveillance and targeting control measures for these locations in the future.
- 1Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, People's Republic of China Sun Yat-sen Center for Migrant Health Policy, Guangzhou, People's Republic of China.
- 2Sun Yat-sen Center for Migrant Health Policy, Guangzhou, People's Republic of China Faculty of Social Sciences, Department of Psychology, University of Macau, Taipa, Macau, People's Republic of China Department of Health Behavior and Society and Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
- 3Department of Global Health, School of Public Health, Peking University, Beijing, People's Republic of China.
- 4Department of Health Behavior and Society and Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
- 5Sun Yat-sen Center for Migrant Health Policy, Guangzhou, People's Republic of China UNC-Project China, Guangzhou, People's Republic of China UNC Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
- Sex Transm Infect. 2016 Feb 3. pii: sextrans-2015-052268. doi: 10.1136/sextrans-2015-052268
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