Imputation of the Date of HIV Seroconversion in a Cohort of Seroprevalent Subjects: Implications for Analysis of Late HIV Diagnosis

Table 1

Years between imputed date of seroconversion and date of HIV diagnosis in the whole cohort (𝑛=3667).

	Years between imputed date of seroconversion and date of HIV diagnosis
	N	Median (P25–P75)	Mean	𝑃
Sex				<0.001
Men	2854	2.90 (1.24–5.40)	3.66
Women	813	2.32 (0.98–4.60)	3.15
Age at HIV diagnosis				<0.001
Up to 20	158	1.31 (0.49–2.55)	1.66
21–30	1239	2.11 (0.86–4.36)	2.93
31–40	1361	2.99 (1.32–5.56)	3.78
41–50	599	3.67 (1.70–6.05)	4.25
51–60	219	4.16 (2.18–6.44)	4.59
Over 60	74	4.27 (2.22–6.42)	4.57
Not available	17	3.66 (2.04–5.57)	4.11	—
Transmission category				<0.001
Injection drug user	578	1.82 (0.59–4.40)	2.87
Men who have sex with men	1581	2.73 (1.25–5.17)	3.57
Heterosexual risk exposure	1376	3.08 (1.38–5.53)	3.76
Other (vertical, transfusions, tattoos, etc.)	58	3.03 (1.33–5.48)	3.63
Don’t know/No answer	74	3.81 (1.83–6.10)	4.28
Educational level				0.790
No education or less than primary	257	2.88 (1.07–5.20)	3.46
Primary	1214	2.68 (1.09–5.20)	3.49
Secondary completed	1011	2.79 (1.22–5.25)	3.57
University completed	524	2.84 (1.29–5.33)	3.66
Not available	661	2.75 (1.19–5.20)	3.54	—
Country of origin				0.011
Spain	2512	2.57 (1.07–5.06)	3.42
Western Europe	114	2.96 (1.23–5.40)	3.74
Eastern Europe and Russia	72	2.97 (1.46–5.16)	3.58
Sub-Saharan Africa	246	3.54 (1.68–5.88)	4.04
North Africa	58	3.89 (1.77–6.35)	4.51
Latin America	631	3.04 (1.36–5.45)	3.71
Other/not available	34	2.84 (1.46–5.25)	3.77
AIDS				<0.001
Yes	633	4.13 (2.01–6.19)	4.32
No	3034	2.49 (1.09–4.90)	3.38
Death				0.081
Yes	86	4.08 (1.84–6.12)	4.25
No	3581	2.73 (1.16–5.21)	3.53
Total	3667	2.76 (1.17–5.24)	3.54