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Observed to Expected Ratios are used to compared the actual occurrences of an event to the predicted occurrences of the event.  In pellucid, OE ratios are calculated for the value field, and the numerator becomes the Observed count, while the denominator becomes the Expected count.  Mathematically, an OE ratio greater than 1 indicates that more instances took place than were predicted, while an OE ratio of less than one indicates that less incidents took place compared to what was expected.
These measures are compared to state averages, which is used to populate sig_var_state
SQL to locate these measures: 
.

All Observed to Expected Ratio Measures

select a.measure_id, a.author_measure_id, a.name_friendly
from measures as a, measure_groups_measures as b
where a.measure_id = b.measure_id 
and b.measure_group_id = 25
.
measure_idauthor_measure_idname_friendly
12196OE:PQI 02Observed to Expected Ratio: Perforated Appendix
12197OE:PQI 07Observed to Expected Ratio: Hypertension Admissions
12198OE:PQI 14Observed to Expected Ratio: Uncontrolled Diabetes Admissions
12199OE:PQI 15Observed to Expected Ratio: Adult Asthma Admissions
12200OE:PQI 10Observed to Expected Ratio: Dehydration Admissions
12201OE:PQI 11Observed to Expected Ratio: Bacterial Pneumonia Admissions
12202OE:PQI 12Observed to Expected Ratio: Urinary Tract Infection Admissions
12203OE:PQI 13Observed to Expected Ratio: Angina Admissions
12204OE:PQI 16Observed to Expected Ratio: Lower Extremity Amputations
12205OE:PQI 01Observed to Expected Ratio: Diabetes Short-term Complications Admissions
12206OE:PQI 08Observed to Expected Ratio: Congestive Heart Failure Admissions
12207OE:PQI 03Observed to Expected Ratio: Diabetes Long-term Complications Admissions
12208OE:PQI 05Observed to Expected Ratio: Chronic Obstructive Pulmonary Disease Admissions
16761OE:IQI 08Observed to Expected Ratio: Esophageal Resection Mortality Rate
16762OE:IQI 09Observed to Expected Ratio: Pancreatic Resection Mortality Rate
16763OE:IQI 09aObserved to Expected Ratio: Pancreatic Resection Mortality Rate Stratum A
16764OE:IQI 09bObserved to Expected Ratio: Resection Mortality Rate Stratum B
16765OE:IQI 11Observed to Expected Ratio: Abdominal Aortic Aneurysm (AAA) Repair Mortality Rate
16766OE:IQI 11aObserved to Expected Ratio: Abdominal Aortic Aneurysm (AAA) Repair Mortality Rate Stratum A
16767OE:IQI 11bObserved to Expected Ratio: Abdominal Aortic Aneurysm (AAA) Repair Mortality Rate Stratum B
16768OE:IQI 11cObserved to Expected Ratio: Abdominal Aortic Aneurysm (AAA) Repair Mortality Rate Stratum C
16769OE:IQI 11dObserved to Expected Ratio: Abdominal Aortic Aneurysm (AAA) Repair Mortality Rate Stratum D
16770OE:IQI 12Observed to Expected Ratio: Coronary Artery Bypass Graft (CABG) Mortality Rate
16771OE:IQI 13Observed to Expected Ratio: Craniotomy Mortality Rate
16772OE:IQI 14Observed to Expected Ratio: Hip Replacement Mortality Rate
16773OE:IQI 15Acute Myocardial Infarction (AMI) Mortality Rate
16774OE:IQI 16Heart Failure Mortality Rate
16775OE:IQI 17Acute Stroke Mortality Rate
16776OE:IQI 17aObserved to Expected Ratio: Acute Stroke Mortality Rate Stratum A
16777OE:IQI 17bObserved to Expected Ratio: Acute Stroke Mortality Rate Stratum B
16778OE:IQI 17cObserved to Expected Ratio: Acute Stroke Mortality Rate Stratum C
16779OE:IQI 18Gastrointestinal Hemorrhage Mortality Rate
16780OE:IQI 19Hip Fracture Mortality Rate
16781OE:IQI 20Pneumonia Mortality Rate
16805oeIQI IQI 26Observed to Expected Coronary Artery Bypass Graft (CABG) Rate - Area Level
16806oeIQI IQI 27Observed to Expected Percutaneous Coronary Intervention (PCI) Rate - Area Level
16807oeIQI IQI 28Observed to Expected Hysterectomy Rate - Area Level
16808oeIQI IQI 29Observed to Expected Laminectomy or Spinal Fusion Rate - Area Level
16809oeIQI IQI 30Percutaneous Coronary Intervention (PCI) Mortality Rate
16810oeIQI IQI 31Carotid Endarterectomy Mortality Rate
16811oeIQI IQI 32Observed to Expected Acute Myocardial Infarction (AMI) Mortality Rate, Without Transfer Cases
16830oePDI PDI 01Observed to Expected Accidental Puncture and Laceration, Pediatric
16831oePDI PDI 02Observed to Expected Pressure Ulcer Rate
16832oePDI PDI 05Observed to Expected Iatrogenic Pneumothorax Rate
16833oePDI PDI 06Observed to Expected RACHS-1 Pediatric Heart Surgery Mortality Rate
16834oePDI PDI 08Observed to Expected Perioperative Hemorrhage or Hematoma Rate
16835oePDI PDI 09Observed to Expected Postoperative Respiratory Failure Rate
16836oePDI PDI 10Observed to Expected Postoperative Sepsis Rate
16837oePDI PDI 11Observed to Expected Postoperative Wound Dehiscence Rate
16838oePDI PDI 12Observed to Expected Central Venous Catheter-Related Blood Stream Infection Rate
16847oePDI PDI 14Observed to Expected Admission Rate (Area Level): Asthma
16848oePDI PDI 15Observed to Expected Admission Rate (Area Level): Diabetes Short-Term Complications Admission Rate
16849oePDI PDI 16Observed to Expected Admission Rate (Area Level): Gastroenteritis
16850oePDI PDI 17Observed to Expected Admission Rate (Area Level): Perforated Appendix
16851oePDI PDI 18Observed to Expected Admission Rate (Area Level): Urinary Tract Infection
16852oePDI PDI 90Observed to Expected Admission Rate (Area Level): Pediatric Quality Overall Composite
16853oePDI PDI 91Observed to Expected Admission Rate (Area Level): Pediatric Quality Acute Composite
16854oePDI PDI 92Observed to Expected Admission Rate (Area Level): Pediatric Quality Chronic Composite
16856oePQI PQI 05Observed to Expected COPD or Asthma in Older Adults
16857oePQI PQI 09Observed to Expected Low Birth Weight
16859oePQI PQI 15Observed to Expected Asthma in Younger Adults Admissions
16860oePQI PQI 90Observed to Expected Overall Preventive Care
16861oePQI PQI 91Observed to Expected Overall Acute Preventive Care
16862oePQI PQI 92Observed to Expected Overall Chronic Preventive Care
16864oePSI PSI 02Observed to Expected Unexpected Deaths
16865oePSI PSI 03Pressure Ulcer
16866oePSI PSI 04Observed to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications
16869oePSI PSI 04aObserved to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications Stratum A
16872oePSI PSI 04bObserved to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications Stratum B
16875oePSI PSI 04cObserverd to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications Stratum C
16878oePSI PSI 04dObserved to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications Stratum D
16881oePSI PSI 04eObserved to Expected Death Rate among Surgical Inpatients with Serious Treatable Complications Stratum E
16883oePSI PSI 06Collapsed Lung caused by Medical Care
16884oePSI PSI 07Central Venous Catheter-related Bloodstream Infections
16885oePSI PSI 08Postoperative Hip Fracture
16887oePSI PSI 09Postoperative Hemorrhage or Hematoma
16889oePSI PSI 11Postoperative Respiratory Failure
16891oePSI PSI 10Postoperative Physiologic and Metabolic Derangement
16892oePSI PSI 12Postoperative Lung Embolism or Deep Vein Thrombosis (clotting)
16893oePSI PSI 13Postoperative Sepsis
16894oePSI PSI 14Wound Complications in Abdominal Wall Surgery
16895oePSI PSI 15Accidental Puncture and Laceration