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Table 29. Charlson index by procedure
Table of charlson by PR1
charlson
PR1(Principal procedure)
Total
Frequency
Row Pct
Col Pct
3610
3611
3612
3613
3614
3615
3616
3617
3619
0
2
0.02
25.00
1497
13.46
29.28
3174
28.54
23.60
2983
26.83
22.64
1591
14.31
22.07
1684
15.14
26.23
181
1.63
35.63
0
0.00
0.00
8
0.07
33.33
11120
1
4
0.02
50.00
1887
11.12
36.91
4969
29.29
36.95
4874
28.73
36.99
2655
15.65
36.83
2376
14.01
37.02
190
1.12
37.40
0
0.00
0.00
9
0.05
37.50
16964
2
2
0.02
25.00
1124
9.96
21.99
3388
30.03
25.19
3355
29.73
25.46
1818
16.11
25.22
1504
13.33
23.43
85
0.75
16.73
3
0.03
100.00
4
0.04
16.67
11283
3
0
0.00
0.00
416
8.99
8.14
1346
29.10
10.01
1407
30.42
10.68
814
17.60
11.29
605
13.08
9.43
35
0.76
6.89
0
0.00
0.00
3
0.06
12.50
4626
4
0
0.00
0.00
139
9.66
2.72
411
28.56
3.06
442
30.72
3.35
251
17.44
3.48
186
12.93
2.90
10
0.69
1.97
0
0.00
0.00
0
0.00
0.00
1439
5
0
0.00
0.00
38
10.50
0.74
124
34.25
0.92
81
22.38
0.61
67
18.51
0.93
47
12.98
0.73
5
1.38
0.98
0
0.00
0.00
0
0.00
0.00
362
6
0
0.00
0.00
7
8.86
0.14
26
32.91
0.19
26
32.91
0.20
9
11.39
0.12
11
13.92
0.17
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
79
7
0
0.00
0.00
4
16.67
0.08
5
20.83
0.04
7
29.17
0.05
2
8.33
0.03
4
16.67
0.06
2
8.33
0.39
0
0.00
0.00
0
0.00
0.00
24
8
0
0.00
0.00
0
0.00
0.00
6
75.00
0.04
0
0.00
0.00
1
12.50
0.01
1
12.50
0.02
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
8
9
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
1
50.00
0.01
0
0.00
0.00
1
50.00
0.02
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
2
Total
8
5112
13449
13176
7208
6419
508
3
24
45907
used in the models in Chapter 4. The optimal model for mortality is a neural network model. The lift
function (Figure 25) shows that the model can predict up through the 50
th
decile.
We look at the predicted versus actual values for mortality (Table 31). Given the values in Table 31,
four hospitals have a predictive mortality of zero. Therefore, these hospitals will rank lower than any
of the other hospitals. The two hospitals with the greatest differential are #10 and #3, so they will rank
high in quality even though hospital #3 also has the highest actual mortality. Yet it is hospital 5 that has
the greatest proportion of patients in the highest Charlson level; yet it has a moderate actual mortality
level.
We also examine length of stay by hospital and Charlson Index. The optimal predictive model is a
decision tree (Figure 26). The first split is on sex followed by age, and then by level of Charlson Index.
The hospital code is not included in the tree model. The average error is given in Figure 27.
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