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Background
The National Health Interview Survey has been one of the principal sources of information that enables public health sectors to monitor the health status of the population. The first National Health Interview Survey (NHIS) in Taiwan was conducted in 2001 with joint efforts from the National Health Research Institutes (NHRI) and the Taiwan HPA. Since then, the survey has been conducted every four years to collect policy-relevant information which enables policy-making and program evaluation.

Aim of the Survey
● To investigate people’s health status and health behavior
● To understand people’s medical and preventative care utilization
● To collect policy-relevant information for decision making and program evaluation

Sampling Design  
The most recent survey was conducted in 2017. The interviewees in this survey comprised a national and city/county representative sample of the whole population in Taiwan (excluding Kinmen County and Lienchiang County). Multistage stratified systematic sampling design was applied. The townships were stratified by the urbanization and location before sampling. Village/Lin in sampled townships and then the individual in sampled village/Lin were selected step by step following the principle of probability proportional to size (PPS).

Survey Method
Data was collected using face to face interview. Since 2009, computer-assisted personal interview tool was implemented to improve efficiency of the survey and quality of data. 
Self-administered questionnaires were sometimes applied to those who complete face to face questionnaire interview and were eligible to fill out the self-administered questionnaires. For example, an anonymous self-administered questionnaire was applied in 2005 and 2009 with the involvement of National Bureau of Controlled Drugs (NBCD), now merged into the Food and Drug Agency, to investigate the prevalence of illicit drug use. Also in 2017, two short sets of health literacy questionnaire were applied as optional modules on two randomly selected sub-samples of the survey.


Content of the Survey
There were three sets of questionnaire designated for interviewees aged under 12, 12 to 64, and 65 or above respectively. The contents of the questionnaire are:
● Personal characteristics
● Health status
● Knowledge of disease prevention
● Medical and preventive care utilization
● Health behaviors
● Occupation and economic status

For international comparison, NHIS also includes health measurements, such as:
● 36-Item Short Form (SF-36)
● Euro Qol-5 Dimension (EQ-5D)
● Center for Epidemiologic Studies Depression Scale (CES-D)
● Global Activity Limitation Indicator (GALI)
● Mini-Mental State Examination (MMSE)


Sample representativeness, and response rate 
● 2001 National health interview survey (2001 NHIS)
Representativeness of the sample: Whole population in Taiwan and 7 sub-national regions, aboriginal towns, off-shore islands
Number of respondents and response rate: 6,721 households (91.4%); 25,464 persons (93.8%)

● 2002 National Survey on Knowledge, Attitude and Practice of Health
Promotion (2002 NHIS ;HP-KAP Survey)
Representativeness of the sample: Population aged 15+ in Taiwan area; National and City/County representative
Number of respondents and response rate: 26,755 persons (81.9%)

● 2005 National health interview survey (2005 NHIS)
Representativeness of the sample: Whole population in Taiwan area, National and City/County representative
Number of respondents and response rate: 24,726 persons (80.59%)

● 2009 National health interview survey (2009 NHIS)
Representativeness of the sample: Whole population in Taiwan area, National and City/County representative
Number of respondents and response rate:25,636 persons (84.0%)

● 2013 National health interview survey (2013 NHIS)
Representativeness of the sample: Whole population in Taiwan area, National and City/County representative
Number of respondents and response rate:23,296 persons (75.2%)

● 2017National health interview survey (2017 NHIS)
Representativeness of the sample: Whole population in Taiwan area, National and City/County representative
Number of respondents and response rate:21,111 persons (72.8%)
 
Viewer:4157
Modify Date:2019/06/24 Publish Date:2017/11/01