| | Characteristic | Anion gap, mmol/L | value | | Missing | Overall | Q1 () | Q2 () |
| | All patients | | 948 | 503 | 445 | | | Admission,(%) | 0 | | | | 0.007 | | Direct emer | | 43 (4.5) | 23 (4.6) | 20 (4.5) | | | Direct observation | | 1 (0.1) | 1 (0.2) | 0.0 (0.0) | | | Elective | | 16 (1.7) | 7 (1.4) | 9 (2.0) | | | Ew emer. | | 434 (45.8) | 251 (49.9) | 183 (41.1) | | | Observation admit | | 213 (22.5) | 88 (17.5) | 125 (28.1) | | | Surgical same day admission | | 39 (4.1) | 22 (4.4) | 17 (3.8) | | | Urgent | | 202 (21.3) | 111 (22.1) | 91 (20.4) | | | Ethnicity,(%) | 0 | | | | 0.016 | | American Indian/Alaska native | | 1 (0.1) | 1 (0.2) | 0.0 (0.0) | | | Asian | | 28 (3.0) | 10 (2.0) | 18 (4.0) | | | Black/African American | | 150 (15.8) | 72 (14.3) | 78 (17.5) | | | Hispanic/Latino | | 42 (4.4) | 20 (4.0) | 22 (4.9) | | | Other | | 143 (15.1) | 65 (12.9) | 78 (17.5) | | | White | | 584 (61.6) | 335 (66.6) | 249 (56.0) | | | | | | | | | Age, mean (year) | 0 | 65.5 (14.0) | 66.7 (13.3) | 64.2 (14.8) | 0.005 | | Gender,(%) | 0 | | | | 0.118 | | Female | | 474 (50.0) | 264 (52.5) | 210 (47.2) | | | Male | | 474 (50.0) | 239 (47.5) | 235 (52.8) | | | Hypertension,(%) | 0 | | | | 0.004 | | No | | 774 (81.6) | 393 (78.1) | 381 (85.6) | | | Yes | | 174 (18.4) | 110 (21.9) | 64 (14.4) | | | Diabetes,(%) | 0 | | | | 0.085 | | No | | 555 (58.5) | 308 (61.2) | 247 (55.5) | | | Yes | | 393 (41.5) | 195 (38.8) | 198 (44.5) | | | Coronary atherosclerosis,(%) | 0 | | | | 0.044 | | No | | 666 (70.3) | 368 (73.2) | 298 (67.0) | | | Yes | | 282 (29.7) | 135 (26.8) | 147 (33.0) | | | Congestive heart failure,(%) | 0 | | | | 0.034 | | No | | 620 (65.4) | 345 (68.6) | 275 (61.8) | | | Yes | | 328 (34.6) | 158 (31.4) | 170 (38.2) | | | Peripheral vascular,(%) | 0 | | | | 0.896 | | No | | 901 (95.0) | 478 (95.0) | 423 (95.1) | | | Yes | | 47 (5.0) | 25 (5.0) | 22 (4.9) | | | Hyperlipidemia,(%) | 0 | | | | 0.273 | | No | | 545 (57.5) | 298 (59.2) | 247 (55.5) | | | Yes | | 403 (42.5) | 205 (40.8) | 198 (44.5) | | | AMI,(%) | 0 | | | | 0.417 | | No | | 937 (98.8) | 499 (99.2) | 438 (98.4) | | | Yes | | 11 (1.2) | 4 (0.8) | 7 (1.6) | | | Respiratory failure,(%) | 0 | | | | 0.297 | | No | | 578 (61.0) | 315 (62.6) | 263 (59.1) | | | Yes | | 370 (39.0) | 188 (37.4) | 182 (40.9) | | | ESRD,(%) | 0 | | | | <0.001 | | No | | 883 (93.1) | 489 (97.2) | 394 (88.5) | | | Yes | | 65 (6.9) | 14 (2.8) | 51 (11.5) | | | Laboratory parameters | | | | | | | WBC, mean (SD) (109/L) | 13 | 10.7 (6.1) | 9.8 (5.7) | 11.7 (6.5) | <0.001 | | BUN, mean (SD) (mg/dL) | 0 | 27.4 (21.2) | 22.7 (15.1) | 32.7 (25.5) | <0.001 | | Creatinine, mean (SD) (mEq/L) | 1 | 1.4 (1.5) | 1.0 (0.7) | 1.9 (2.0) | <0.001 | | MCH, mean (SD) (pg) | 13 | 29.4 (2.5) | 29.5 (2.4) | 29.3 (2.6) | 0.338 | | MCHC, mean (SD) (g/L) | 13 | 32.1 (1.6) | 32.0 (1.6) | 32.1 (1.6) | 0.888 | | MCV, mean (SD) (fl) | 13 | 91.8 (6.8) | 92.0 (6.6) | 91.5 (7.1) | 0.222 | | Platelet, mean (SD) (109/L) | 13 | 271.7 (155.3) | 268.5 (150.6) | 275.2 (160.4) | 0.511 | | RBC, mean (SD) (1012/L) | 13 | 3.2 (0.7) | 3.2 (0.6) | 3.3 (0.7) | 0.059 | | RDW, mean (SD) (%) | 13 | 16.1 (2.5) | 16.2 (2.6) | 16.0 (2.5) | 0.396 |
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