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Table 1 The 2 × 2 table for PI 1.4

From: Transcranial Doppler pulsatility index is a poor predictor of hydrocephalus in patients with aneurysmal subarachnoid haemorrhage

Index test Hydrocephalus + Hydrocephalus - Total
PI >1.4 7 5 12
PI ≤1.4 23 58 81
Total 30 63 93