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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