Table 1 Raw and Manually Derived feature descriptive statistics of the whole target population, those who were not readmitted within 30 days, and those who were. The lab test features are not shown

Raw Features

Sex (Female)

266,549 (62%)

253,429 (63%)

13,120 (52%)

Age

< 1

12,841 (3%)

10,257 (3%)

2584 (10%)

1–14

20,020 (5%)

19,279 (5%)

741 (3%)

15–24

34,125 (8%)

32,931 (8%)

1194 (5%)

25–64

243,808 (57%)

233,650 (58%)

10,158 (41%)

≥ 65

117,875 (27%)

107,578 (27%)

10,097 (41%)

Length of Index Admission Stay

2 (4)

2 (4)

4 (7)

Discharge Disposition

01: Transferred to an acute care inpatient institution

133 (0.03%)

101 (0.03%)

32 (0.1%)

02: Transferred to Continuing Care

10,081 (2%)

9311 (2%)

770 (3%)

03: Transferred to Other Facility

2249 (0.5%)

2055 (0.5%)

194 (0.8%)

04: Discharged to home or home setting with support services

33,954 (8%)

29,805 (7%)

4149 (17%)

05: Discharged home (no support services required)

376,625 (88%)

357,453 (89%)

19,172 (77%)

06: Signout (left against medical advice) & AWOL (absent without leave)

4699 (1%)

4065 (1%)

634 (3%)

07: Died

567 (0.1%)

566 (0.1%)

1 (0.004%)

12: Patients who do not return

361 (0.08%)

339 (0.08%)

22 (0.09%)

Manually Defined Features (Excluding Lab-Based Features)

Admitted through ED - Index

377,112 (88%)

353,341 (88%)

23,771 (95%)

Num. procedures - Index

1.54 (1.70)

1.57 (1.69)

1.06 (1.87)

Num. unique procedures - Index

1.53 (1.65)

1.56 (1.64)

1.04 (1.77)

Num. unique ICD codes - Index

4.32 (3.66)

4.27 (3.59)

5.16 (4.52)

Num. unique drugs - Index / Last 2y

1.47 (2.48) /

7.18 (6.73)

1.43 (2.41) /

6.99 (6.55)

2.12 (3.26) / 10.31 (8.50)

Num. prescribed days - Index / Last 2y

46.62 (125.33) /

1730.75 (2719.67)

45.01 (122.87) /

1671.71 (2680.03)

71.35 (157.82) /

2685.03 (3144.93)

Num. prescription records - Index / Last 2y

2.40 (16.83) /

53.85 (162.04)

2.33 (15.68) / 51.39 (156.83)

3.49 (29.76) /

93.62 (226.78)

Num. hospital admissions - last 6 m / 1y

0.16 (0.50) /

0.26 (0.72)

0.14 (0.45) /

0.23 (0.64)

0.46 (0.98) /

0.73 (1.43)

Num. emergency department visits - last 6 m / 1y

1.45 (2.58) /

2.06 (4.00)

1.39 (2.44) /

1.97 (3.74)

2.44 (4.18) /

3.52 (6.76)

Num. non-emergency department visits - last 6 m / 1y

3.72 (8.69) /

5.63 (14.76)

3.60 (8.30) /

5.42 (14.07)

5.52 (13.46) /

8.92 (22.96)

Total length-of-stay in hospital - last 6 m / 2y

1.47 (8.12) /

4.78 (21.28)

1.26 (7.41) /

4.26 (19.77)

4.98 (15.25) /

13.26 (37.07)

Num. General Practice Visits - last 6 m / 1y

8.98 (10.89) /

14.29 (16.77)

8.79 (10.43) /

13.97 (16.03)

12.18 (16.27) /

19.62 (25.37)

Num. General Surgery Visits - last 6 m / 1y

0.52 (2.09) /

0.68 (2.80)

0.50 (1.94) /

0.65 (2.56)

0.79 (3.73) /

1.14 (5.35)

Num. Internal Medicine Visits - last 6 m / 1y

1.00 (3.61) /

1.44 (5.22)

0.92 (3.28) /

1.32 (4.71)

2.26 (6.98) /

3.37 (10.22)

Patient with physician claim incurred - last 2y / 3y / 4y

416,397 (97%) /

417,609 (97%) /

418,188 (98%)

393,196 (97%) /

394,359 (98%) /

394,921 (98%)

23,201 (93%) /

23,250 (93%) /

23,267 (93%)

Claimed amount - last 2y / 3y / 4y

1835.68 (2038.73) /

2389.30 (2601.73) /

2870.56 (3086.34)

1790.39 (1932.89) /

2330.13 (2470.42) /

2800.01 (2934.25)

2567.71 (3222.20) /

3345.84 (4069.96) /

4010.92 (4790.24)

Comorbidity

Charlson score, mean (Std.Dev)

0.42 (0.99)

0.40 (0.96)

0.81 (1.42)

Hypertension

124,407 (29%)

114,068 (28%)

10,339 (41%)

Diabetes

59,359 (14%)

54,119 (13%)

5240 (21%)

Heart failure

26,217 (6%)

22,534 (6%)

3683 (15%)

Asthma

8503 (2%)

8013 (2%)

490 (2%)