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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)

From: The application of unsupervised deep learning in predictive models using electronic health records

Variables

Overall Index Admissions

n = 104,398

Index Admissions by the Value of Readmit30

YES (11.70%)

n = 12,211

NO (88.30%) n = 92,187

1. Length of Stay

4.45 (4.45)

5.61 (5.47)

4.30 (4.27)

2. Acuity

81,048 (77.63)

10,641 (87.14)

70,407 (76.37)

3. Number of ER Encounters in Last Six Months

0.36 (0.91)

0.58 (1.28)

0.33 (0.85)

4. Number of Inpatient Encounters in Last Year

6.01 (12.84)

12.04 (19.83)

5.21 (11.36)

5. Polypharmacy

18.88 (8.94)

19.19 (8.41)

18.84 (9.01)

6. Number of Inpatient Encounters in Last Six Months

0.62 (1.30)

1.17 (1.74)

0.55 (1.21)

7. Discharge Disposition

 Home/Self Care

45,931 (44.00)

3816 (31.25)

42,115 (45.68)

 Home Care

23,290 (22.31)

3560 (29.15)

19,730 (21.40)

 SNF

25,669 (24.59)

3668 (30.04)

22,001 (23.87)

 Rehab

2948 (2.82)

367 (3.01)

2581 (2.80)

 LTC, Federal Hospital

1783 (1.71)

463 (3.79)

1320 (1.43)

 AMA

551 (0.53)

99 (0.81)

452 (0.49)

 Others

4226 (4.05)

238 (1.95)

3988 (4.33)

8. Mean Albumin Level

 < 3.4 g/dl

54,177 (51.89)

8087 (66.23)

46,090 (50.00)

 3.4–5.0 g/dl

20,535 (19.67)

1829 (14.98)

18,706 (20.29)

 > 5

134 (0.13)

11 (0.09)

123 (0.13)

 Unknown

29,552 (28.31)

2284 (18.70)

27,268 (29.58)

9. Leukemia Current

297 (0.28)

64 (0.52)

233 (0.25)

10. Leukemia History

1272 (1.22)

246 (2.01)

1026 (1.11)

11. Malignancy Current

5043 (4.83)

847 (6.94)

4196 (4.55)

12. Malignancy History

26,620 (25.50)

3924 (32.13)

22,696 (24.62)

13. RF without Hemo Current

14,061 (13.47)

2348 (19.23)

11,713 (12.71)

14. History of Alcohol Substance Abuse

20,641 (19.77)

2954 (24.19)

17,687 (19.19)

15. Dementia Current

3305 (3.17)

398 (3.26)

2907 (3.15)

16. Dementia History

15,559 (14.90)

2143 (17.55)

13,416 (14.55)

17. Trauma Current

7900 (7.57)

949 (7.77)

6951 (7.54)

18. Trauma History

50,428 (48.30)

6995 (57.28)

43,433 (47.11)