Table 2. Available CD4 cell measurements, frequency and follow-up time of 1959 seroconverters from European and sub-Saharan African (SSA) cohorts.

	Group
	Europe (non-African origin)	Europe (African origin)	SSA	Overall
	Median (IQR)	Median (IQR)	Median (IQR)	Median (IQR)	P-value
Time from seroconversion to first CD4 cell measurement (months)	6.1 (2.7, 11.2)	7.4 (3.6, 12.1)	3.7 (0.6, 7.8)	5.3 (2.4, 10.1)	<0.001
Time from seroconversion to last available CD4 cell measurement (years)	3.5 (2.1, 5.2)	3.4 (2.0, 5.1)	3.5 (1.6, 6.3)	3.5 (1.8, 5.7)	0.566
Time from seroconversion to last CD4 cell measurement after applying truncation* (years)	2.1 (1.1, 3.5)	1.6 (1.0, 3.1)	2.9 (1.4, 5.4)	2.3 (1.2, 4.0)	<0.001
Interval between consecutive CD4 cell measurements (months)	3.2 (2.3, 4.6)	2.9 (1.6, 4.4)	2.9 (2.4, 3.9)	3.0 (2.3, 4.4)	0.001
Number of CD4 cell measurements	5 (3, 9)	4 (2, 8)	10 (6, 15)	7 (3, 11)	<0.001

^*CD4 cell measurements after cART initiation or AIDS onset were truncated for this analysis; IQR: Interquartile Range.