We decided to look only at kids five and younger; to look at only one level per child—the highest level; and to include all kids no matter what was in their chart as a potential source. As for time period, we agreed that we’d look at an equal length of time before and after the water switch—January 1, 2013, to April 24, 2014, versus April 25, 2014, to September 9, 2015.
