Table 3. Calculating “cohort retention” in care stratified by “ART-age cohorts.” .

‘ART-Age cohort’	Death (D)	Loss to follow-up (LTFU)	Number of patients retained by the end of the “calendar” (Ret)	Number of attrition during the “calendar” (Att) = D+LTFU	Proportion of attrition (%Att) = Att/(Ret+Att)	Retention rate (% Ret) = Ret/(Ret+Att)
<1 year	D1	LTFU1	Ret1	Att1	%Att1	%Ret1
<2 years	D2	LTFU2	Ret2	Att2	%Att2	%Ret2
<3 years	D3	LTFU3	Ret3	Att3	%Att3	%Ret3
<4 years	D4	LTFU4	Ret4	Att4	%Att4	%Ret4
<5 years	D5	LTFU5	Ret5	Att5	%Att5	%Ret5
<N years	DN	LTFUN	RetN	AttN	%AttN	%RetN