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Table 1 Characteristics of true-positive and false-positive population

From: HIV infection in Xi’an, China: epidemic characterization, risk factors to false positives and potential utility of the sample-to-cutoff index to identify true positives using Architect HIV Ag/Ab combo

Characteristics

TP population n = 117

FP population n = 100

p-value

Sex

 Male

89 (76.07%)

61 (61%)

0.019

 Female

28 (23.93%)

39 (39%)

Age, median (IQR), years

30 (26–41)

52.5 (45–63.5)

0.000

 ─ 40

86 (73.5%)

20 (20%)

0.000

 40–60

27 (23.08%)

31 (31%)

0.219

  ≥ 60

4 (3.42%)

49 (49%)

0.000

Ethnicity

 Han

115 (98.29%)

99 (99%)

>0.05

 Minority

2 (1.71%)

1

Source of patients

 Outpatients

106 (90.6%)

9 (9%)

0.000

 Hospitalized patients

11 (9.4%)

91 (91%)

Marital status

 Unmarried

52 (44.44%)

8 (8%)

0.000

 Married

65 (55.56%)

92 (92%)

Transmission modes

 Male homosexual contact

41 (35.04%)

 

 Heterosexual contact

59 (50.43%)

 

 Injecting drug

6 (5.13%)

 

 Unknown

11 (9.4%)

 

Job

 College students

22 (18.8%)

 

 Unemployed/informal employees

34 (29.06%)

 

 Formal employees

50 (42.74%)

 

 Peasants

2 (1.71%)

 

 Unknown

9 (7.69%)

 

COI, median (IQR)

470.53 (273.99–628.21)

3.21 (1.82–8.58)

0.000

Clinical symptoms

 Flu-like

  Fever

12

1

 

  Painful pharynx and larynx

2

0

 

  Swelling of tonsil

4

0

 

  Swelling of lymph nodes

5

0

 

  Total

23 (19.66%)

1 (1%)

0.000

 Skin diseases

  Rashes

6

1

 

  Genital herpes

4

0

 

  Genital condyloma

4

0

 

  Perianal condyloma

3

0

 

  Perianal abscess

10

0

 

  Total

27 (23.08%)

1 (1%)

0.000