Methods for enrollment of the study participants have been previously described [ 35].
We detail the successful PCCRI methods for enrollment, direct observation and data collection for this complex "field" environment.
This paper describes the study design, including site selection, a surveillance system to characterize the demography and healthcare utilization practices of the catchment population, methods for enrollment, data collection and follow-up of case and control children, and quality control activities.
The methods used for enrollment and data collection have been described in detail previously.
Community outreach was the prime method of enrollment for studies that focused on cryotherapy (64%).
Given the varying graduation dates of entries and given changing enrollments, this is not a precise method of adjusting for enrollment variation, but it combines the virtue of simplicity with relative accuracy.
If your account becomes overdue, or if you do not fulfill your membership commitment within the time period indicated in the offer, or if you cancel your membership before fulfilling your commitment, the QPB will charge you (depending upon your selected payment method upon enrollment) for the outstanding books you agreed to buy.
On the basis of sampling methods, 21,668 patients were eligible for enrollment in the etiology study and 10,746 enrolled (50% of eligible, 27% of all ALRI).
Whereas random selection was thought to be too logistically complicated to realistically implement, the remaining methods with preselected days or times for enrollment were thought to be subject to selection bias resulting from families bringing their children during "study" times.
For each method, we recorded the total time required for enrollment, and the time required for manual transcription (paper) onto a computer database.
