Does the Patient Clinical Complexity Level (PCCL) reflect nursing acuity?
© Bayliss-McCulloch; licensee BioMed Central Ltd. 2007
Published: 26 November 2007
Approximately 30% of inpatient costs relate to nursing care. Many hospitals are relinquishing their use of patient dependency systems following the introduction of ratio based nursing awards and the omission of this functionality from replacement computer systems architecture. Ratcliffe* has proposed a PCCL adjusted bedday and activity model for the allocation of nursing costs. (*Ratcliffe, Kevin; Clinical Costing of Nursing Activity – Benchmarking Project.)
To examine the relationship between Patient Clinical Complexity Level (PCCL) and nursing activity/cost as measured by patient dependency scores, and therefore ascertain the suitability of the PCCL as a patient dependency surrogate.
Patient dependency, length of stay, transfer, and nursing cost data were extracted from the Royal Women's Hospital patient costing system, and nursing costs allocated to patients according to their individual patient dependency scores. Costs relating to 6 Patient Care Areas [PCAs] (3 general wards, ICU, surgical, & oncology wards) wholly costed by the existing patient dependency data were examined. Investigation into the relationship between PCCL scores, length of stay, and acuity was undertaken by plotting case frequency by LOS and PCCL, and by depicting total and daily cost variability by PCCL using box plot techniques. Variability of average daily cost by PCCL across DRGs was illustrated in graphical form.
In 2005/6, the Royal Women's Hospital treated 32,673 patients. 18,169 cases were subsequently identified as being treated within the 6 patient care areas under investigation (representing 21,015 case/PCA splits) and were further trimmed to 18,127 cases (total cost < $100,000, daily cost < $2,500). Nursing costs for these areas totalled $29.1 M and were allocated across 895 service codes (allocation types) representing approximately 464,000 allocation items.
Analysis of total cost by PCCL across the targeted costed population base revealed a correlation of r2 = 0.1157 and the PCCL/Length of Stay relationship showed a similar correlation of r2 = 0.1206. The daily cost/PCCL relationship was insignificant at r2 = 0.0223, though correlation of the median daily cost was significant at r2 = 0.9117. Results of further analysis of daily costs by PCCL within each Patient Care Area were inconsistent.
To eliminate the potential confounding influence of relatively fixed high nurse/patient ratios within the ICU area and the uncertain clinical relevance of unqualified newborns1, these cases were excluded to produce a new costed population comprising 12,689 acute cases. The revised total cost/PCCL correlation improved to r2 = 0.1525 and the PCCL/Length of Stay relationship increased further to r2 = 0.1638. However, the daily cost/PCCL correlation remained insignificant at r2 = 0.0079 while the median cost relationship deteriorated to r2 = 0.3856 in a negative direction.
These results suggest that length of stay rather than nursing intensity increases with PCCL. Furthermore, the inconsistency of the PCCL cost relationship across DRGs does not support the use of the PCCL as a global measure of nursing acuity.
This article is published under license to BioMed Central Ltd.