Case (Treatment T2)                                             Control(Treatment T1)
Response Positive (+) Response Negative (–) Total (ni.)
Response Positive (+) N11 n12 n1.(=n11+n12)
Response Negative (–) N21 n22 n2.(=n21+n22)
Total (n.j) N.1(=n11+n21) n.2(=n12+n22) n..(=n)
Table 1: Fourfold Table for the presentation of Data on Matched Samples.