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Invasive studies used to confirm hydrocephalus. Variable denominators reflect unavailability of data on some patients (162 patients developed hydrocephalus).
| Study | Frequency |
|---|---|
| ICP monitoring | 7/80 (9%) |
| CSF drainage (ventricular or lumbar) | 23/80 (29%) |
| Lumbar puncture | 17/81 (21%) |
| Other | 1/74 (1%) |
