Table 1 Descriptive statistics of important variables for Readmit30. For binary variables like Acuity, the figures represent the number of positive cases and corresponding percentage of the sample (in parenthesis). For numeric variables like Length of Stay, the figures are sample means and corresponding standard deviations (in parenthesis)

n = 104,398
YES (11.70%)
n = 12,211
NO (88.30%) n = 92,187
1. Length of Stay4.45 (4.45)5.61 (5.47)4.30 (4.27)
2. Acuity81,048 (77.63)10,641 (87.14)70,407 (76.37)
3. Number of ER Encounters in Last Six Months0.36 (0.91)0.58 (1.28)0.33 (0.85)
4. Number of Inpatient Encounters in Last Year6.01 (12.84)12.04 (19.83)5.21 (11.36)
5. Polypharmacy18.88 (8.94)19.19 (8.41)18.84 (9.01)
6. Number of Inpatient Encounters in Last Six Months0.62 (1.30)1.17 (1.74)0.55 (1.21)
7. Discharge Disposition
Home/Self Care45,931 (44.00)3816 (31.25)42,115 (45.68)
Home Care23,290 (22.31)3560 (29.15)19,730 (21.40)
SNF25,669 (24.59)3668 (30.04)22,001 (23.87)
Rehab2948 (2.82)367 (3.01)2581 (2.80)
LTC, Federal Hospital1783 (1.71)463 (3.79)1320 (1.43)
AMA551 (0.53)99 (0.81)452 (0.49)
Others4226 (4.05)238 (1.95)3988 (4.33)
8. Mean Albumin Level
< 3.4 g/dl54,177 (51.89)8087 (66.23)46,090 (50.00)
3.4–5.0 g/dl20,535 (19.67)1829 (14.98)18,706 (20.29)
> 5134 (0.13)11 (0.09)123 (0.13)
Unknown29,552 (28.31)2284 (18.70)27,268 (29.58)
9. Leukemia Current297 (0.28)64 (0.52)233 (0.25)
10. Leukemia History1272 (1.22)246 (2.01)1026 (1.11)
11. Malignancy Current5043 (4.83)847 (6.94)4196 (4.55)
12. Malignancy History26,620 (25.50)3924 (32.13)22,696 (24.62)
13. RF without Hemo Current14,061 (13.47)2348 (19.23)11,713 (12.71)
14. History of Alcohol Substance Abuse20,641 (19.77)2954 (24.19)17,687 (19.19)
15. Dementia Current3305 (3.17)398 (3.26)2907 (3.15)
16. Dementia History15,559 (14.90)2143 (17.55)13,416 (14.55)
17. Trauma Current7900 (7.57)949 (7.77)6951 (7.54)
18. Trauma History50,428 (48.30)6995 (57.28)43,433 (47.11)