Table 1:

Relationship between pseudo-SAH findings and degree of cerebral edema*†

Pseudo-SAH Finding	Degree of Cerebral Edema
Pseudo-SAH Finding	None	Mild	Severe	Total
Positive	0	0	19	19
Negative	35	22	4	61
Total	35	22	23	80

* P < .0001 (χ² test).
† Numeric values in the cells represent the number of CT examinations.