Background
 In order to understand health conditions and risk behaviors of the general population, and to evaluate the effectiveness of projects on health promotion, the Health Promotion Administration (HPA) launched the first Behavioral Risk Factor Surveillance System (BRFSS) in 2007 by referring to the U.S. BRFSS. This telephone interview survey targets on people aged over 15 in Taiwan, with special focus on health issues and behavior risk factors. Since 2007, BRFSS has been conducted annually to monitor the current status and trends of health conditions and relevant behavior risk factors among people in Taiwan.

Aim of the Survey
(1) To understand health conditions and relevant behavior risk factors and the varying trends among people over the age of 15 in Taiwan from the national and county/city representative survey data.
(2) To establish the nationwide and county/city-wide database of health conditions and relevant behavior risk factors of people over the age of 15, and could use as references for future planning, surveillance, and evaluation of health promotion programs and the effectiveness of interventions.

Content of the Survey Questionnaire
 The questionnaire of this survey covers two parts:
Core questions: to collect data on the national and city/county level.
Optional questions: data collected are only nationally representative.
The core questions include health conditions, life satisfaction, chronic diseases, and health related behaviors, such as exercise, smoking, chewing betel nuts, dietary and utilization of cancer screening. The optional questions are designed year by year for collection of policy relevant data.

Sampling and Survey Method
 By using Chunghwa Telecom Home Telephone Directory as the sampling frame and Probability Proportional to Size (PPS) as the sampling method, the sampling system first generated the telephone prefixes. With Random Sampling Method, it selected entries of the last two digits, the result of which served as the sample telephone numbers. The schedule of the survey is: 1) first period: from April to June; 2) second period: from Sep to Nov. After phone calls are answered, samples will be selected within every household and responded to the survey. The sample size of the most recent survey was 24,564.

Data Process and Analysis
 The survey data are checked and cleaned before analysis. To ensure a good representative of the target population, post-stratification weighting is applied and goodness of fit test is used to determine whether the distribution of the respondents in gender, age and residence matched the characteristics of the target population.

Survey Result
 Results of the survey are published in the format of survey reports, press releases and conference or journal paper.