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Table 4 Options for calculating overlap probability πXC.

From: PopMod: a longitudinal population model with two interacting disease states

Case πXC calculated as Comment
1 πC·πX C and X are independent
2 πC|X·πX C and X interact and πC|X or πX|C is known.
3 πX|C·πC  
4 πC·πX / [πC + (1 - πC) / RRX|C] C and X are dependent and the relative risk RRX|C or RRC|X is known.
5 πX·πC / [πX + (1 - πX) / RRC|X] X (C) either potentiates, or protects from, C (X).
6 πX·πC·k