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We present an analysis of the first 10 weeks of the severe acute respiratory syndrome (SARS) epidemic in Hong Kong. The epidemic to date has been characterized by two large clusters-initiated by two separate "super-spread" events (SSEs)-and by ongoing community transmission. By fitting a stochastic model to data on 1512 cases, including these clusters, we(More)
BACKGROUND The International Physical Activity Questionnaire-Short Form (IPAQ-SF) has been recommended as a cost-effective method to assess physical activity. Several studies validating the IPAQ-SF have been conducted with differing results, but no systematic review of these studies has been reported. METHODS The keywords "IPAQ", "validation", and(More)
In different weather conditions, constituents and concentrations of pollutants, personal exposure, and biologic responses to air pollution may vary. In this study we assessed the effects of four air pollutants on mortality in both cool and warm seasons in Hong Kong, a subtropical city. Daily counts of mortality, due to all nonaccidental causes, and(More)
OBJECTIVE To assess the mortality currently associated with smoking in Hong Kong, and, since cigarette consumption reached its peak 20 years earlier in Hong Kong than in mainland China, to predict mortality in China 20 years hence. DESIGN Case-control study. Past smoking habits of all Chinese adults in Hong Kong who died in 1998 (cases) were sought from(More)
This paper reviews current understanding of the epidemiology, transmission dynamics and control of the aetiological agent of severe acute respiratory syndrome (SARS). We present analyses of data on key parameters and distributions and discuss the processes of data capture, analysis and public health policy formulation during the SARS epidemic are discussed.(More)
BACKGROUND In July, 1990, a restriction was introduced over one weekend that required all power plants and road vehicles in Hong Kong to use fuel oil with a sulphur content of not more than 0.5% by weight. This intervention led to an immediate fall in ambient sulphur dioxide (SO2). We assessed the effect of this intervention on mortality over the next 5(More)
OBJECTIVE To compare BMI with waist circumference (WC), waist-to-hip ratio (WHR), and waist-to-stature ratio (WSR) in association with diabetes or hypertension. METHODS AND PROCEDURES Cross-sectional data from 16 cohorts from the DECODA (Diabetes Epidemiology: Collaborative Analysis of Diagnostic criteria in Asia) study, comprising 9,095 men and 11,732(More)
CONTEXT The few published prospective studies of smoking and mortality in China have reported low relative risks, but the durations of follow-up were short. OBJECTIVE To assess the mortality of ever- and never-smokers in a cohort after 20 years of follow-up. DESIGN, SETTING, AND SUBJECTS A cohort analytic study in a machinery factory in Xi'an, China,(More)
OBJECTIVES The Patient Health Questionnaire-9 (PHQ-9) assesses depressive symptoms by self-report, is brief, and was developed to correspond to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, criteria for major depression. This article presents information regarding its reliability and validity and the distribution of scores in a(More)
The causal interpretation of reported associations between daily air pollution and daily admissions requires consideration of residual confounding, correlation between pollutants, and effect modification. If results obtained in Hong Kong and London--which differ in climate, lifestyle, and many other respects--were similar, a causal association would be(More)