Table 6.
Balance obtained by matching exactly for the five procedure groups and using the Mahalanobis distance for other variables, in place of the proposed combination of fine-balance and near-exact matching that produced Table 5. Unlike Table 5, this table displays substantial imbalances for this interaction, although the column totals are the same.
| Readmitted cases (R) or
controls (C) not readmitted |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Colectomy |
||||||||||
| With cancer | Wo cancer | Hip | Knee | Thoracotomy | ||||||
| Hospital | R | C | R | C | R | C | R | C | R | C |
| 1 | 8 | 9 | 4 | 2 | 2 | 2 | 10 | 10 | 8 | 3 |
| 2 | 5 | 8 | 1 | 7 | 5 | 8 | 16 | 16 | 1 | 4 |
| 3 | 6 | 5 | 3 | 1 | 8 | 6 | 12 | 12 | 4 | 3 |
| 4 | 4 | 2 | 0 | 1 | 10 | 8 | 10 | 10 | 0 | 0 |
| 5 | 7 | 6 | 5 | 5 | 5 | 5 | 3 | 4 | 7 | 12 |
| 6 | 3 | 5 | 2 | 2 | 1 | 2 | 4 | 4 | 0 | 0 |
| 7 | 10 | 14 | 3 | 0 | 3 | 3 | 10 | 8 | 8 | 6 |
| 8 | 3 | 4 | 1 | 2 | 5 | 4 | 4 | 5 | 5 | 4 |
| 9 | 11 | 7 | 4 | 2 | 8 | 10 | 5 | 5 | 4 | 4 |
| 10 | 3 | 5 | 0 | 2 | 3 | 2 | 10 | 10 | 3 | 1 |
| ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ | ⋮ |
| 47 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| Total | 329 | 329 | 150 | 150 | 264 | 264 | 323 | 323 | 314 | 314 |