The e-Prevalence survey supports measurement of TB program effectiveness and SDG achievement. First proposed by CheckTB! to the NTP of Ghana in 2012 it allows all participant data - including the dCXR - to be merged in one electronic file that can be sent over any mobile phone network to a central database. This significantly reduces survey cost and time to complete, increases data quality & integrity and therefore set new standards.
A typical survey in a TB high burden setting reaches a sample size of 50,000- 80,000 and a cluster size of 500-800. Normally 12-15 staff members are needed per field team for 6–10 months with 3-4 teams in operation. Average costs of traditional surveys are estimated at US$ 2-3 million including Capital Investment (CXR, Lab, Cars), Human Resource (salaries), Survey Operation (Field and Central), Pre & Post survey events, technical assistance. e-Prevalence allows for significant reductions in operational cost and lead time.
- Participant data collected on site electronically with PDA entering automatically into the central database and printing a unique barcode
- Questionnaire (downloading from 1) all applicable c.q. permitted personal data); selection menu for scoring and automated counting of result
- On site make digital Chest X-ray (downloading from 1) all applicable c.q. permitted personal data, including the CAD abnormality score and related reading results on site)
- Automatic back-up on local computer workstation and forwarding of the participant file including questionnaire, CAD score and compressed CXR over 3G or 4G network to central database for data consolidation and in case applicable centralised 2nd reading of the CXR
- Fill out fields for smear microscopy and culture results if applicable