Figure 6. Assessment of medication dose. Quality control chart for the use of chloral hydrate (xbar chart) shows the mean medication dose over time. The upper and lower control limits are shown as dashed horizontal bars set to the 3
level. The upper control limit (upper dashed horizontal line) is 97 mg/kg; the lower control limit (lower dashed horizontal line) is 77 mg/kg. The mean dose (solid horizontal line) is 87 mg/kg.