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Table 1 Pooled data passed from a node to the Analytical Center. We assume a 1:1 matched design. Here V1 i(1) (V2 i(1))denotes the pooled level of variable 1 (variable 2) for the ith case pool and V1 i(0) (V2 i(0))denotes the pooled level of variable 1 (variable 2) for the ith control pool within the node, i = 1, 2, …, k, where each pool consists of either g cases or g matched controls

From: Addressing data privacy in matched studies via virtual pooling

Pool id Pooled Covariate V1 Pooled Covariate V2 Pooled Covariate …
  Case Control Case Control Case Control
1 V1 1(1) V1 1(0) V2 1(1) V2 1(0)
i V1 i(1) V1 i(0) V2 i(1) V2 i(0)
k V1 k(1) V1 k(0) V2 k(1) V2 k(0)