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200128P - CROSS SECTIONAL STUDIES 3: HEALTH SURVEYS

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Presented at CRC course KFMC on January 28, 2020 by Prof Omar Hasan Kasule Sr Professor of Epidemiology and Bioethics, King Fahad Medical City. 


DEFINITION OF HEALTH SURVEYS

  • Surveys involve more subjects than the usual epidemiological sample
  • Surveys are used for the measurement of health and disease, assessment of needs, assessment service utilization, and care. 
  • They may be population or sample surveys. 
  • Surveys may be cross-sectional or longitudinal.


PLANNING SURVEYS 1: PRELIMINARIES

  • literature survey, 
  • stating objectives, 
  • identifying and prioritizing the problem, 
  • formulating a hypothesis


PLANNING SURVEYS 2: SAMPLING

  • defining the population, 
  • defining the sampling frame, 
  • determining sample size and sampling method, 
  • The household is the usual sampling unit. 
  • Sampling may be simple random sampling, systematic sampling, stratified sampling, cluster sampling, or multistage sampling.


PLANNING SURVEYS 3: LOGISTICS

  • Training study personnel, 
  • Considering logistics (approvals, manpower, materials and equipment., finance, transport, communication, and  accommodation)


PLANNING SURVEYS 4: DATA COLLECTION

  • Preparing and pre-testing the study questionnaire.
  • Use existing data 
  • Collect new data using a questionnaire (postal, telephone, diaries, and interview), physical examinations, direct observation, and laboratory investigations. 
  • The structure and contents of the survey report are determined by potential readers. 
  • The report is used to communicate information and also apply for funding.