Table 1.

A contingency table of diagnostic tests

Test	Disease		Total
	Present	Absent
Positive	TP	FP	TP + FP
Negative	FN	TN	FN + TN
Total	TP + FN	FP + TN

Notes: “Disease” in this study corresponds to the presence of an improvement or worsening in the degree of metamorphopsia in daily life after epiretinal membrane surgery.

Abbreviations: TP, true positive response; FN, false negative response; FP, false positive response; TN, true negative response.