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Table 6 Pair types with tied data with at least one event

From: On hazard ratio estimators by proportional hazards models in matched-pair cohort studies

Type Number of pairs Observed data in the pair Observed time Y k1 Y k0
10 n 10 Exposed gets event and unexposed censored simultaneously X k1 = X k0 1 0
11 n 11 Unexposed gets event and exposed censored simultaneously X k1 = X k0 0 1
12 n 12 Exposed and unexposed get events simultaneously X k1 = X k0 1 1