Table 2.

Incidence^* per 100,000 donations among first time and repeat donors, REDS II study in Brazil, 2007–2008.

Characteristics	First Time Donors			Repeat Donors
	Incidence	95% CI	p value	Incidence	95% CI	p value
Overall	38.49	(25.55 – 51.42)		22.55	(17.05 – 28.04)
Blood Center			0.84			0.55
Recife	43.88	(19.06 – 68.71)		26.98	(18.54 – 35.43)
Belo Horizonte	33.36	(8.65 – 58.07)		20.09	(11.07 – 29.11)
São Paulo	37.49	(18.52 – 56.46)		20.48	(13.98 – 26.99)
Type of Donation			0.006			0.10
Community	55.02	(33.87 – 76.17)		25.51	(19.90 – 31.11)
Replacement	19.48	(5.98 – 32.98)		15.83	(8.53 – 23.13)
Age			0.02			0.03
age <25	28.75	(10.93–46.56)		27.10	(14.82 – 39.38)
age ≥ 25 – <35	61.60	(33.15–90.06)		27.96	(19.75 – 36.16)
age ≥ 35 – <45	27.05	(0.54–53.55)		23.68	(14.89 – 32.46)
age ≥ 45 – <55	0	(0.00–40.24)		8.22	(1.08 – 15.36)
age ≥ 55	97.22	(0.00–231.93)		0.00	(0.00 – 25.45)
Gender			0.06			0.04
Female	22.88	(7.03–38.74)		13.09	(6.39 – 19.78)
Male	48.71	(29.99–67.43)		26.11	(20.46 – 31.77)
Education			0.42			0.73
< 8 years	16.59	(0.00–49.12)		14.64	(1.61 – 27.67)
Complete 8 years	50.15	(1.01–99.28)		27.87	(11.76 – 44.00)
Complete 11 years	16.97	(2.10–31.85)		21.50	(13.52 – 29.48)
Complete College	13.62	(0.00–40.31)		20.07	(6.35 – 33.78)
Race			0.15			0.79
Black	26.72	(0.00–63.74)		21.99	(4.62 – 39.35)
Mixed	53.36	(28.00–78.72)		18.31	(10.18 – 26.44)
White	18.66	(3.73–33.59)		23.66	(14.39 – 32.94)
Other	0.00	(0.00–262.02)		47.80	(0.00 – 126.10)
Year			0.04			0.99
2007	51.92	(34.50–78.12)		22.50	(14.63–34.60)
2008	24.98	(13.83–45.10)		22.57	(16.78–30.34)

^*First time donor incidence rate based on 34 recently HIV infected cases (as determined by ‘detuned’ assay); repeat donor incidence rate based on estimated 64.6 incident HIV cases within the 2 year study period.