Many patients had multiple ED visits and were screened more then once (~1400). Only the first screen was used in data analysis. Multiple visits by individual patients are not reflected in the N of the overall sample frame.
*Does not include patients treated at study ED on days not covered by research recruiting staff , or those not in a treatment room between 9 am and 11pm.(i.e. major holidays, RA vacation days, RA sick days. Missed or partially covered shifts account for ~ N= 11,416 patients over 2 year time frame)
** Excluded: Tallied for 12 months of study and doubled to estimate second year.