The effect on the patient flow in local health care services after closing a suburban primary care emergency department: a controlled 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 (UCL) or lower (LCL) control limits on the control chart (i.e., a data point that exceeds 3 σ).

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