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Table 1 Characteristics of the study population

From: Demographic determinants of syphilis seroprevalence among U.S. blood donors, 2011–2012

Variable

Number of donors (n = 798,761)

(%)

Sex

  

Male

404,956

(51)

Female

393,798

(49)

Age

  

16-19

161,244

(20)

20-29

164,829

(21)

30-39

114,473

(14)

40-49

118,913

(15)

50+

239,302

(30)

Race/Ethnicity

  

Caucasian

494,913

(62)

African American

29,624

(4)

Hispanic

148,201

(19)

Asian

21,410

(3)

Native American

9,756

(1)

Other

22,091

(3)

Unknown

72,766

(9)

Education

  

< High school

148,147

(19)

High school

107,236

(13)

Some college

267,519

(33)

Bachelors

129,969

(16)

Masters/PhD

59,859

(7)

Missing

86,031

(11)

Country of birth

  

USA

662,390

(83)

Non-USA

54,286

(7)

Missing

82,085

(10)

Donation history

  

First time

202,323

(25)

Repeat

596,438

(75)

Region of residence

  

Northern

293,493

(39)

Western

239,619

(32)

Southern

214,779

(29)

Syphilis status

  

Seropositive

436

(0.05)

Active

55

(0.007)