Table 3.
Demographic statistics of dataset split. For hypothesis testing, we conducted Welch's two-tailed t-test to compare the means of age and length-of-stay-at-hospital between two independent groups and Pearson’s Chi-square test for other categorical variables. To account for multiple comparisons, p-values were adjusted using the Bonferroni Correction. All p-values > 0.05 indicate that there is no evidence to suggest that the groups are statistically different or that there is an association between the categorical variables tested
| Missing | Overall | Train | Validation | Test | p—value | ||
|---|---|---|---|---|---|---|---|
| Demographic features | 1732 | 1212 | 173 | 347 | |||
| Gender, n (%) | Female | 0 | 778 (44.9) | 535 (44.1) | 129 (49.6) | 114 (43.8) | 0.255 |
| Male | 954 (55.1) | 677 (55.9) | 131 (50.4) | 146 (56.2) | |||
| Length of stay at hospital, days, mean (SD) | 0 | 10.0 (12.6) | 10.1 (13.4) | 8.7 (7.9) | 10.4 (12.5) | 0.192 | |
| Age, years, mean (SD) | 0 | 62.0 (58.3) | 61.8 (56.4) | 64.4 (65.4) | 61.0 (59.2) | 0.77 | |
| Ethnicity, n (%) | Caucasian | 0 | 1206 (69.6) | 843 (69.6) | 180 (69.2) | 183 (70.4) | 0.996 |
| Unknown/Not specified | 158 (9.1) | 116 (9.6) | 25 (9.6) | 17 (6.5) | |||
| African American | 134 (7.7) | 93 (7.7) | 17 (6.5) | 24 (9.2) | |||
| Admission type, n (%) | Emergency | 0 | 1174 (67.8) | 822 (67.8) | 169 (65.0) | 183 (70.4) | 0.567 |
| Newborn | 287 (16.6) | 192 (15.8) | 52 (20.0) | 43 (16.5) | |||
| Elective | 228 (13.2) | 166 (13.7) | 32 (12.3) | 30 (11.5) | |||
| Insurance, n (%) | Private | 0 | 761 (43.9) | 526 (43.4) | 115 (44.2) | 120 (46.2) | 0.612 |
| Medicare | 733 (42.3) | 509 (42.0) | 116 (44.6) | 108 (41.5) | |||
| Medicaid | 152 (8.8) | 112 (9.2) | 22 (8.5) | 18 (6.9) | |||
| Religion, n (%) | Catholic | 18 | 555 (32.4) | 390 (32.5) | 78 (30.4) | 87 (33.7) | 0.357 |
| Not specified | 369 (21.5) | 249 (20.8) | 64 (24.9) | 56 (21.7) | |||
| Unobtainable | 273 (15.9) | 181 (15.1) | 50 (19.5) | 42 (16.3) | |||
| Marital status, n (%) | Married | 363 | 682 (49.8) | 472 (48.6) | 99 (49.7) | 111 (56.1) | 0.338 |
| Single | 370 (27.0) | 276 (28.4) | 49 (24.6) | 45 (22.7) | |||
| Widowed | 198 (14.5) | 139 (14.3) | 37 (18.6) | 22 (11.1) | |||