Figure 4

Statistical process control chart, thiazide usage, PrimeCare, July 2002–March 2005. Upper and lower control limits (dashed lines) are ± 3 SE, based on pre-intervention period.
Statistical process control chart, thiazide usage, PrimeCare, July 2002–March 2005. Upper and lower control limits (dashed lines) are ± 3 SE, based on pre-intervention period.