A Comparison of Different Intensive Care Unit Definitions Derived from the German Administrative Data Set: A...

Area of Science:

• Healthcare Management
• Critical Care Medicine
• Health Services Research

Background:

• Intensive care units (ICUs) are vital but scarce resources, requiring precise utilization metrics.
• Existing benchmarks are limited by heterogeneous definitions of what constitutes an ICU.
• This study addresses the need for a uniform ICU definition in Germany.

Purpose of the Study:

• To analyze patient distribution, characteristics, and outcomes across ten different ICU definitions.
• To establish a baseline for developing a nationwide, uniform ICU definition.
• To assess the impact of varying ICU definitions on population size and utilization rates.

Main Methods:

• Analysis of 6,204,093 patients within the German Helios Hospital Group.
• Evaluation of ten distinct ICU definitions, including administrative data and hospital bed classifications.
• Statistical testing of three indicator definitions against the IQM definition.

Main Results:

• 14.7% of 5,980,702 hospital cases met at least one ICU criterion.
• Significant variability in ICU population size was observed, ranging from 1.9% (DOV definition) to 12.1% (LOSi definition).
• The ICUᴧIMC definition (individual bed classification) is proposed as the most plausible approximation based on mechanical ventilation rates.

Conclusions:

• ICU definition critically impacts population size, utilization, outcomes, and capacity assumptions.
• Stating the specific ICU definition used is essential for accurate comparisons.
• A mandatory, clearly defined nationwide ICU term is recommended for improved benchmarking and data analysis.