The Joint Commission
Proportion and Ratio Measures (HAP/CAH)
Joint Commission Guide for Data Entry of ChartAbstracted Measures for Hospitals (HAP/CAH)
 Version 2023: Discharges 010123 (1Q2023) through 123123 (4Q2023)
 Version 2024: Discharges 010124 (1Q2024) through 123124 (4Q2024); March 2024
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Proportion measures are measures in which the value of each measurement is expressed as a proportion where the numerator is expressed as a subset of the denominator.
Ratio measures are measures in which the value of each measurement is expressed as a ratio where the numerator and the denominator measure different phenomena.
The following aggregate data elements are required to be entered for proportion and ratio measures:
Denominator
Number of Unique Patients Within the Numerator (ratio measures only)
Numerator
Name:  Denominator 
Aggregated For:  Proportion and ratio measures 
Definition:  Summation of denominator cases (proportion) or the denominator component (ratio) for the measure's population during the month. The Denominator is the count of each patientlevel record with a measure category assignment of â€˜Dâ€™ or â€˜Eâ€™ (i.e., [count of â€˜Dâ€™ + count of â€˜Eâ€™] = Denominator). Aggregate all caselevel records that are members of a measure's population. Do not eliminate or suppress outliers. Note:
Denominator = (Psychiatric Inpatient Days  Leave Days), submitted as Hours 
Allowable Values:  0 through 10,000,000 (whole numbers only) Note:Â Hospitals entering a zero for this data element will be required to attest that they have no cases in the denominator (i.e., â€˜zero denominatorâ€™) for the measure for the month. Hospitals with denominator cases are expected to enter the appropriate value for each measure or strata. 
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Name:  Number of Unique Patients Within the Numerator 
Aggregated For:  Ratio measures only 
Definition:  For the HBIPS2 and 3, this is the number of unique patients represented in the data element Numerator. If no event occurred during the month (Numerator = 0), enter a zero (0) for this data element. Examples for a single patient with multiple numerator events:

Allowable Values:  0 through 10,000,000 (whole numbers only) 
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Name:  Numerator 
Aggregated For:  Proportion and ratio measures 
Definition:  Summation of numerator cases (proportion) or the numerator component (ratio) in a measure's population during the month. The Numerator is the count of all patientlevel records with a measure category assignment = â€˜E.â€™ Aggregate all caselevel records that are members of a measure's population. Do not eliminate or suppress outliers. Note:

HBIPS2 and 3 Strata  Incorrect Overall Calculation  Correct Overall Calculation 
B  1.3454  Rounded (1.3454) = 1.345 
C  2.0044  Rounded (2.0044) = 2.004 
D  3.2544  Rounded (3.2544) = 3.254 
E  0.0014  Rounded (0.0014) = 0.001 
Overall  Sum strata (1.3454 + 2.0044+ 3.2544 + 0.0014) = Round overall (6.6056) = 6.606  Sum rounded strata (1.345 + 2.004+ 3.254 + 0.001) = overall 6.604 
Allowable Values: 

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