Table 2.

Contingency table showing sensitivity and specificity of abnormal findings in a full neurological examination with regard to detecting underlying acute structural brain damage in n = 853 unconscious emergency patients

	n = 853	Positive examinations	Negative examinations
I	Primary cause, acute brain damage	244	86	74% Sensitivity
II	Primary cause, no acute brain damage	108	104	60% Specificity
III	Secondary cause	102	209

Sensitivity = proportion of positive examinations among all patients with acute brain damage (I); specificity = proportion of negative examinations among all patients without acute brain damage (II + III)