Table 1.

List of defined random variables.

DEFINITION	NOTATION IN
	TARGET	CROSS-SECTIONAL
	POPULATION
date of birth	B*	B
age at recruitment	W*	W
age at onset	X*	X
total lifetime	Z*	Z
disease status at age u	D*(u)	D(u)
lifetime disease status	D* = D*(∞)	D = D(∞)
censoring time	—	C
ind. of prevalence at time t0	—	Δ0 = 𝕀(0,W)(X)D
ind. of death	—	Δ1 = 𝕀(0,W+C)(Z)
total follow-up time	—	V = min(Z, W + C)