Table 2.

The time period of the various chart configurations, medication orders during each period, and RAR events during each period

Maximum number of allowable charts	Intervention start date	Intervention end date	No. of months	Mean orders/month (SD)	Mean RAR events/month (SD)	RAR events/100 000 orders
4 charts	November 1, 2010	November 20, 2012	24a	19 609 (1476)	16.9 (5.5)	85.9
2 charts	November 21, 2012	September 29, 2014	22	19 873 (988)	16.5 (6.3)	82.9
4 charts	September 30, 2014	August 31, 2016	23b	21 838 (1694)	17.8 (6.1)	82.2

^aOnly complete monthly data were used: November 2012 was not included for analysis; ^bfor analysis, data were used from October 1, 2014.