Table 1.
Encounters and demographics: comparison of nationwide inpatient sample (NIS) and health facts® (HF) EHR population
| HCUP NIS | HF | Rel diff (%) | t-value | ||
|---|---|---|---|---|---|
| Std. error | |||||
| Total discharges | 39008298 (100.00 %) | 723539 | 38787005 | 0.57 | 0.31 |
| Northeast | 7579674 (19.43 %) | 317987 | 7603789 (19.60 %) | 0.32 | 0.08 |
| Midwest | 8839256 (22.66 %) | 320253 | 8897944 (22.94 %) | 0.66 | 0.18 |
| South | 14985984 (38.42 %) | 483009 | 15055887 (38.82 %) | 0.47 | 0.14 |
| West | 7603384 (19.49 %) | 294165 | 7229385 (18.64 %) | 4.92 | 1.27 |
| Length of Stay (Mean) | 4.7 | 0 | 4.75 | ||
| Length of Stay (Median) | 3 | N/A | 3 | ||
| Age (Mean) | 48.36 | 0.37 | 47.38 | 2.03 | 2.65* |
| Male | 16485595 (42.26 %) | 312023 | 16207543 (41.79 %) | 1.69 | 0.89 |
| Female | 22436406 (57.52 %) | 429631 | 22549349 (58.14 %) | 0.50 | 0.26 |
| In-hospital Deaths | 740748 (1.90 %) | 17443 (0.03 %) | 633121 (1.63 %) | 14.53 | 6.17* |
*Indicates t-values over 1.960. These are categories that are significantly different between the data sets at 95 % confidence