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Table 1 Demographic status of the populations examined

From: Variants in the CYP7B1 gene region do not affect natural resistance to HIV-1 infection

Characteristics Colombia Italy Peru
SP (n = 51) HESN (n = 62) SP (n = 114) HESN (n = 125) SP (n = 95) HESN (n = 130)
Age, mean years ± SD 33.9 ± 7.5 35.1 ± 10.6 42.4 ± 8.8 41.6 ± 9.1 30.8 ± 6.7 31.2 ± 10.7
Males, n (%) 26 (50) 27 (44.2) 69 (60.5) 53 (42.4) 94 (99) 123 (90)
Viral load, median copies/mL (interquartile range) 2569 (488–25,075) 10,950 (395–27,410) 29,694 (11,162–63,381)
CD4+ T cell/µL count, median (interquartile range) 366 (190–568) 369 (239–554) 417e (331–544)
Monthly unprotected sexual episodes, mean (range)c 8 (1–30) 8 (1–30) 3 (1.5–10) 7 (1–25)
Previous history of sexually transmitted diseases and/or AIDS-defining illnesses (%) 40 22a 39 ndd 29
Heterosexual orientation (%) 79 90 100 100 ndd 17
Homosexual orientation (%) 3 2 0 0 ndd 44
Bisexual orientation (%) 17 7 0 0 ndd 39
Ethnicity, ancestryb (%) Afr: 25 Afr: 22 European (Tuscan): 100 European (Tuscan): 100 Mestizo: 100 Mestizo: 89
Amer: 40 Amer: 42 Indigenous: 5
Eur: 34 Eur: 35 Others: 6
  1. SP seropositives, HESN HIV-1 exposed seronegative, SD standard deviation, yrs years, Afr African, Amer Amerindian, Eur European
  2. aIn HESNs sexually transmitted diseases but no AIDS-defining illnesses
  3. bAncestry of the Colombian cohort was previously reported [17]
  4. cIn Peru, this refers to number of partners, not sexual episodes
  5. d“nd” is not determined. The majority is gay men but this question was not formally asked
  6. eCohort inclusion criteria was CD4 count >250 (requested by ethics board)