1. Statistical process control charts of adjusted total direct variable cost per discharge.
Statistical process control charts of adjusted total direct variable cost per discharge. (A) *Percentage change in mean adjusted total direct variable cost per discharge relative to the preintervention mean, all patients. (B) *Percentage change in mean adjusted total direct variable cost per discharge relative to the preintervention mean, medical DRGs. (C) *Percentage change in mean adjusted total direct variable cost per discharge relative to the preintervention mean, surgical DRGs. The upper and lower bounds denote the 3 SDs from the mean. The eighth consecutive point below or above the mean and all subsequent ones are indicated in yellow. Points outside the 3 SD range are indicated in red. Costs adjusted for DRG weight; all costs are denominated in September 2011 dollars. CL, center line; DRG, diagnosis related group.
Steven C Chatfield et al. BMJ Qual Saf 2019;28:
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