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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