Table 1.

Characteristics and Cox regression of study participants.

Variable	Individuals at enrolment	HR (95% CI)	P
From EDI to enrolment (days)
Median (range)	70.0 (10–170)	ND	ND
Follow-up time (months)
Median (range)	15.6 (0.7–73.9)	ND	ND
Race/ethnicity, no. (%)
White/non-Hispanic	73 (74.5)	Reference	Reference
Hispanic	19 (19.4)	0.98 (0.20–4.74)	0.984
Other	6 (6.1)	1.69 (0.21–13.70)	0.626
Age groups, no. (%)
19–28	34 (34.7)	2.10 (0.38–11.48)	0.393
29–34	32 (32.7)	2.66 (0.49–14.64)	0.260
35–58	32 (32.7)	Reference	Reference
Number of sexual contacts, no. (%)^a
0–1	29 (30.9)	Reference	Reference
2–3	29 (30.9)	1.97 (0.27–14.27)	0.504
>3	36 (38.3)	4.74 (0.87–25.97)	0.073
Condomless anal intercourse, no. (%)^b	77 (81.1)	1.71 (0.38–7.59)	0.482
CD4⁺ cell count (cells/μl)
Median (IQR)	541.5 (460–719)	0.94 (0.80–1.10)^c	0.438
Viral load (log₁₀ copies per ml)
Median (IQR)	4.7 (3.8–5.4)	1.14 (0.59–2.20)	0.689

CI, confidence interval; EDI, estimated date of primary infection; HR, hazard ratio; IQR, interquartile range; ND, not determined. Data available for

94 and

95 individuals.

Square root scale.