The effect on the patient flow in a local health care after implementing reverse triage in a primary care emergency department: a longitudinal follow-up study.

Specifically, three statistical tests were applied to the data: ( a) a shift in the data, demonstrated by 8 or more consecutive data points, above or below the mean centreline on the control chart, ( b) a statistical trend in the data, which is defined as 6 consecutive data points constantly increasing or decreasing, not counting values that are repeated in the sequence and ( c) a data point that exceeds the upper or lower control limits on the control chart (i.e. a data point that exceeds 3 sigma) [ 13 , 20 ].

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