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Table 1 Nonspecific Chest Pain Index Visit Characteristics, by Type of Index Visit, 2013 and 2014

From: Nonspecific chest pain and hospital revisits within 7 days of care: variation across emergency department, observation and inpatient visits

CharacteristicType of Index Visit
Total, N638,302325,77041,794
 Originated in the ED638,302313,00037,363
 Direct admissionN/A12,7704431
Female, %57.857.052.8
Age, years, mean46.657.960.0
Expected primary payer, %
 Self-pay / No charge18.811.510.5
Patient’s income quartile, %
 Quartile 1 (poorest)35.534.635.9
 Quartiles 2 and 349.547.748.8
 Quartile 4 (wealthiest)13.616.213.7
Location of residence, %
 Large metropolitan37.742.742.4
 Small metropolitan39.634.636.2
Diagnoses reported on the index visit, mean N3.98.310.4
Most frequent coexisting condition, %a
 Elixhauser Comorbiditiesb
  Alcohol abuse1.42.74.7
  Chronic pulmonary disease8.816.821.6
  Congestive heart failure2.55.912.0
  Deficiency anemias1.45.611.0
  Drug abuse1.92.94.4
  Fluid/electrolyte disorders2.39.615.5
  Other neurological disorders1.74.46.3
  Renal failure1.55.312.4
 Related to heart disease
  Other ischemic heart diseasec6.324.441.2
  Prior AMI3.48.513.7
 Revisits, N62,62920,4723591
  1. Abbreviations: AMI Acute myocardial infarction, ED Emergency department, N Number, N/A Not applicable
  2. Note: Percentages may not sum to 100% because some index visits are missing the information
  3. aCoexisting conditions include those from the Elixhauser comorbidity software and those related to heart disease. Only conditions with at least 1% of records in all three settings are shown. The diabetes measure includes diabetes with and without complications
  4. bThe following indicators were defined using the Elixhauser Comorbidity Software, the specifications of which can be found at
  5. cDefined using the ICD-9 CM code 414, Other forms of chronic ischemic heart disease
  6. Source: Agency for Healthcare Research and Quality, Healthcare Cost and Utilization Project, State Inpatient Databases, State Emergency Department Databases, and State Ambulatory Surgery and Services Databases, 10 states (Georgia, Iowa, Maryland, Nebraska, Nevada, South Carolina, South Dakota, Tennessee, Vermont, Wisconsin), 2013 and 2014