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Data collection and information management

Data collection and information management. RAABs: How frequently should these be done at national or sub-national level? Hans Limburg, MD PhD, DCEH. RAAB. Rapid Assessment of Avoidable Blindness Population-based, representative survey Standardised method: comparable worldwide

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Data collection and information management

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  1. Data collection and information management RAABs: How frequently should these be done at national or sub-national level? Hans Limburg, MD PhD, DCEH

  2. RAAB • Rapid Assessment of Avoidable Blindness • Population-based, representative survey • Standardised method: comparable worldwide • Accuracy depends on sample size • Purpose • Baseline data for planning PBL programmes • Evaluation of ongoing PBL programmes • Cost • Standard RAAB (ss 3000: US$ 20,000 – 40,000) • RAAB + DR: twice as much

  3. Main results from RAAB • Prevalence of blindness, SVI, MVI • Prevalence of low vision • Causes of blindness, SVI, MVI • Prevalence of cataract (BCVA<3/60, <6/60, <6/18) • Cataract surgical coverage • Visual outcome after cataract surgery • Barriers to cataract surgery • Age & sex adjusted prevalence, estimated cases • Age at time of surgery; place of surgery; cost; cause of poor outcome

  4. Where surveys were done Custom survey RACSS RAAB

  5. ‘Repeat’ surveys Cambodia: 2000 and 2007: different survey areas Peru: 2002 and 2011: different survey areas

  6. RAAB in Vietnam 2002 and 2007(prevalence and 95% confidence interval)

  7. RAAB: ideal frequency? Capacity to detect significant change • Conditions comparable • Same survey area • Same survey protocol, age groups, definition • Depending upon sample size • Large sample  narrow confidence interval • Depending on intervention activities • 5-7 years for very active programmes • 8-12 year for less active programmes

  8. Web-based repository for RAABs • Year conducted • Survey area • Reference to publication • Name and address Principal Investigator • Downloads (only with permission from PI) • Zip-file with all reports • Cleaned data as Excel file

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