Li, Huizhen. / "March 2008." / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 139-150). / Abstracts in English and Chinese. / Abstract --- p.ii / Acknowledgement --- p.vii / Abbreviations --- p.ix / Introduction --- p.1 / Chapter 1.1 --- HIV and AIDS --- p.4 / Chapter 1.1.1 --- HIV Transmission Routes --- p.5 / Chapter 1.1.2 --- HIV Related Risk Behaviors --- p.6 / Chapter 1.2 --- HIV Burden --- p.7 / Chapter 1.2.1 --- HIV Infection in China --- p.7 / Chapter 1.2.2 --- HIV Infection in Hong Kong --- p.9 / Chapter 1.2.3 --- Methadone Treatment in Hong Kong --- p.10 / Chapter 1.3 --- Objectives and Hypothesis --- p.14 / Chapter 1.4 --- Organization of This Thesis --- p.15 / Literature Review --- p.16 / Chapter 2.1 --- Search Methods --- p.18 / Chapter 2.1.1 --- Formulating Review Questions --- p.18 / Chapter 2.1.2 --- Search Strategy --- p.19 / Chapter 2.1.3 --- Inclusion and Exclusion Criteria --- p.21 / Chapter 2.2 --- Assessing the Quality of Studies --- p.22 / Chapter 2.3 --- Search Results --- p.23 / Chapter 2.3.1 --- Descriptive Summary --- p.25 / Chapter 2.3.2 --- Critique of Reviewed Articles --- p.33 / Chapter 2.4 --- Implication on Planning of Current Study --- p.37 / Chapter 2.4.1 --- Summary of Reviewed Articles --- p.37 / Methods for Exploring Predictors of HIV Risk --- p.40 / Chapter 3.1 --- Data Source --- p.42 / Chapter 3.1.1 --- Data Management in Methadone Clinics --- p.42 / Chapter 3.1.2 --- Source of Data --- p.43 / Chapter 3.2 --- Data Transformation --- p.45 / Chapter 3.3 --- Framework for assessing outcome --- p.48 / Chapter 3.3.1 --- Study population in different analyses --- p.48 / Chapter 3.3.2 --- Risk Score --- p.49 / Chapter 3.3.3 --- Independent Variables --- p.50 / Chapter 3.4 --- Generalized Linear Model --- p.52 / Chapter 3.5 --- Logistic Regression Model --- p.54 / Chapter 3.6 --- Multilevel Analyses --- p.55 / Chapter 3.6.1 --- Variables --- p.56 / Chapter 3.6.2 --- Definition of 'Neighborhood' --- p.56 / Chapter 3.6.3 --- Individual Variables --- p.60 / Chapter 3.6.4 --- Framework for Analyses --- p.60 / Chapter 3.7 --- Field Study --- p.63 / Results: Community Variation of HIV Risk --- p.65 / Chapter 4.1 --- Demographic Description --- p.67 / Chapter 4.1.1 --- Age distribution --- p.67 / Chapter 4.1.2 --- Gender Distribution --- p.68 / Chapter 4.1.3 --- Proportion of New Admission --- p.72 / Chapter 4.2 --- Drug Taking Profile --- p.74 / Chapter 4.2.1 --- Heroin Use --- p.74 / Chapter 4.2.2 --- Injecting Heroin Users --- p.77 / Chapter 4.3 --- HIV related risk behaviors --- p.81 / Chapter 4.3.1 --- Injection History --- p.81 / Chapter 4.3.2 --- Risky Injection Practices --- p.87 / Chapter 4.3.3 --- Sexual Behaviors --- p.93 / Chapter 4.4 --- Correlation between Demographics and Risk Score --- p.94 / Chapter 4.4.1 --- General Linear Regression Model Coefficient --- p.94 / Chapter 4.4.2 --- Risk Predictors in Logistic Regressions --- p.95 / Chapter 4.5 --- Neighborhood Effect --- p.100 / Chapter 4.6 --- On-site Observation --- p.103 / Chapter 4.6.1 --- Demographic Variations --- p.103 / Chapter 4.6.2 --- Drug Use Variations --- p.104 / Chapter 4.6.3 --- Social Background --- p.105 / Discussion --- p.111 / Chapter 5.1 --- Neighborhood Effect --- p.113 / Chapter 5.1.1 --- Variation across Communities --- p.113 / Chapter 5.1.2 --- Implication on Social Network of IDUs --- p.115 / Chapter 5.2 --- Decline of Admissions --- p.117 / Chapter 5.2.1 --- Decrease of New Admissions --- p.117 / Chapter 5.2.2 --- Decline of Readmission in 2003 --- p.119 / Chapter 5.3 --- Female IDU Population --- p.121 / Chapter 5.4 --- Limitations --- p.125 / Chapter 5.4.1 --- Importance of Individual Level Variables and Community Level Variables --- p.125 / Chapter 5.4.2 --- Reliability of Self-reported Data --- p.126 / Chapter 5.4.3 --- Duplicates of Readmissions --- p.126 / Chapter 5.4.4 --- Definition of Syringe Reuse --- p.127 / Chapter 5.4.5 --- Choice of Models --- p.129 / Conclusion and Future Directions --- p.131 / Chapter 6.1 --- Summary of Results --- p.133 / Chapter 6.2 --- Implication of results --- p.134 / Chapter 6.3 --- Future Directions --- p.136 / Bibliography --- p.139