(a)
| Primary source of infection | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Location | CSOM | CHD | Pulm | Trauma | Cryptogenic | Total | ||||||
| Group | I | II | I | II | I | II | I | II | I | II | I | II |
| Parietal | 8 | 4 | 4 | 11 | 4 | 1 | 1 | 23 | 5 | 23 | 22 | 62 |
| Frontal | 4 | 20 | 2 | 3 | — | 1 | — | 6 | 2 | 33 | 8 | 63 |
| Temporal | 6 | 46 | 1 | 3 | — | — | — | 3 | 2 | 11 | 9 | 63 |
| Cerebellar | 4 | 15 | — | — | — | 1 | — | — | — | 2 | 4 | 18 |
| Occipital | 2 | 5 | 1 | 1 | — | — | — | — | 1 | 2 | 4 | 8 |
| Subdural | — | 1 | 1 | — | 2 | — | — | — | — | — | 3 | 1 |
| Total | 24 | 91 | 9 | 18 | 6 | 3 | 1 | 32 | 10 | 71 | 50 | 215 |
CSOM: chronic suppurative otitis media, CHD: congenital heart disease, and Pulm: pulmonary.
Group I: 1987–1993 and Group II: 1994–2010.