Table 1.
Description of Facility, Case-mix, and Geographic Characteristics Among Adult Inpatient Encounters in the Premier Healthcare Database, United States, 2016–2017
| Characteristic | Hospitals (N = 576) |
|---|---|
| Total No. of encounters | 11 701 326 |
| No. of encounters by year | |
| 2016 | 5 834 810 |
| 2017 | 5 866 516 |
| Total patient-days | 64 064 632 |
| Facility fixed characteristics | |
| Urbana | 432 (75) |
| Teaching | 170 (30) |
| Bed size | |
| 0–99 | 126 (22) |
| 100–199 | 143 (25) |
| 200–299 | 102 (18) |
| 300–399 | 82 (14) |
| 400–499 | 41 (7) |
| ≥ 500 | 82 (14) |
| Facility case-mix characteristics | |
| Patient-days, median (IQR) | 80 318 (33 301–157 535) |
| Average patient age, y, median (IQR) | 59 (57–63) |
| Percentage of patient-days in ICUs, median (IQR) | 11 (6–14) |
| Percentage of bacterial infection patient-days, median (IQR)b | 24 (21–27) |
| Average Elixhauser comorbidity index score, mean (SD)c | 3.2 (0.59) |
| Case-mix index, median (IQR) | 1.46 (1.32–1.64) |
| Facility geographical characteristics | |
| US census region and divisiond | |
| Northeast | |
| Mid-Atlantic | 63 (11) |
| New England | 13 (2) |
| South | |
| East South Central | 37 (6) |
| West South Central | 62 (11) |
| South Atlantic | 161 (28) |
| Midwest | |
| West North Central | 46 (8) |
| East North Central | 101 (18) |
| West | |
| Mountain | 25 (4) |
| Pacific | 68 (12) |
Data are presented as no. (%) unless otherwise indicated. Percentages for mutually exclusive subcategories may exceed 100% due to rounding.
Abbreviations: ICU, intensive care unit; IQR, interquartile range; SD, standard deviation; US, United States.
aDesignation provided by Premier, based upon American Hospital Association Annual Survey response.
bAgency for Healthcare Research and Quality (AHRQ) infection diagnosis codes were used to ascertain whether a patient’s primary International Classification of Diseases, Tenth Revision diagnosis was infection-related (AHRQ, 2019). Inpatient-days for encounters with a primary infection diagnosis were treated as “bacterial infection” patient-days.
cElixhauser comorbidity classifications were modified to include primary diagnoses, in addition to secondary diagnoses. Patient Elixhauser scores were calculated as an unweighted sum (1 point per comorbidity), and average scores were calculated for each facility.
dUS census divisions comprise 4 US census regions: Northeast (Middle Atlantic, New England); South (South Atlantic, East South Central, West South Central); Midwest (East North Central, West North Central); and West (Mountain, Pacific). States in each US census division are as follows: New England Division: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont; Middle Atlantic Division: New Jersey, New York, Pennsylvania; East North Central Division: Illinois, Indiana, Michigan, Ohio, Wisconsin; West North Central Division: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota; South Atlantic Division: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, West Virginia; East South Central Division: Alabama, Kentucky, Mississippi, Tennessee; West South Central Division: Arkansas, Louisiana, Oklahoma, Texas; Mountain Division: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming; Pacific Division: Alaska, California, Hawaii, Oregon, Washington.