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Table 2 Characteristics of study participants at enrollment and at each test

From: Point-of-care p24 antigen detection for early infant diagnosis of HIV infection: cross-sectional and longitudinal studies in Zambia

  LYNX Hospital Study NSEBA Study
Participants
(n = 183)
Tests
(n = 210)
Participants
(n = 1857)
Tests
(n = 2608)
Sex – female, n (%) 97 (53.0) 107 (51.0) 936 (50.4) 1361 (52.2)
Age groupa, n (%)
 Birth 0 0 1305 (70.3) 1305 (50.0)
 Postnatal 3 (1.6) 3 (1.4) 81 (4.4) 81 (3.1)
 6 weeks 74 (40.4) 74 (35.2) 247 (13.3) 502 (19.3)
 6 months 84 (45.9) 107 (51.0) 167 (9.0) 607 (23.3)
  > 7 months 22 (12.0) 26 (12.4) 57 (3.1) 113 (4.3)
 All routine after birth 180 (98.4) 207 (98.6) 471 (25.4) 1222 (46.9)
Median (IQR; range) age
 Overall (in weeks) 17.3 (7.9, 28.9; 2.0, 60.6) 23.5 (8.9, 29.0) 0.1 (0.0, 4.6; 0.0, 68.6) 0.9 (0.1, 18.3; 0.0, 104.1)
 Birth (in days) 0.4 (0.2, 0.8; 0.0, 6.7) 0.4 (0.2, 0.8; 0, 6.7)
 Postnatal (in days) 15.0 (14.0, 19.0; 14.0, 19.0) 15.0 (14.0, 19.0; 14.0, 19.0) 10.0 (8.0, 14.0; 7.0, 26.0) 10.0 (8.0, 14.0; 7.0, 26.0)
 6 weeks (in weeks) 7.3 (6.3, 10.1; 4.9, 12.9) 7.3 (6.3, 10.1; 4.9, 12.9) 7.1 (6.3, 8.4; 4.0, 12.9) 6.9 (6.3, 8.3; 4.0, 12.9)
 6 months (in months) 6.1 (4.6, 6.7; 3.1, 7.9) 6.1 (5.3, 6.7; 3.1, 7.9 5.7 (4.0, 6.6; 3.0, 7.9) 6.1 (5.7, 6.7; 3.0, 7.9)
  > 7 months (in months) 9.6 (8.3, 10.7; 8.1, 13.9) 9.4 (8.3, 10.7; 8.1, 13.9) 9.5 (8.5, 10.6; 8.0, 15.7) 9.4 (8.5, 10.7; 8.0, 23.9)
 All routine after birth (in months) 4.1 (1.9, 6.6; 1.1, 13.9) 5.4 (2.2, 6.8; 1.1, 13.9) 2.7 (1.6, 6.2; 0.9, 15.7) 5.2 (1.7, 6.5; 0.9, 23.9)
Mother received ART during pregnancy, n (%) 162 (88.5) 185 (88.1) 1661 (89.5) 2367 (90.9)
Child received prophylactic ART after birth, n (%)b 153 (83.6) 178 (84.5) 791 (88.4) 1477 (89.8)
Mother currently receiving combination ART, n (%)b 174 (95.6) 201 (96.2) 840 (94.2) 1575 (95.9)
  1. ART Antiretroviral therapy, IQR Interquartile range
  2. a Birth defined as 0–6 days; postnatal as 7–28 days; 6 weeks as 4–13 weeks; 6 months as 3–7 months; all routine after birth as 6 weeks, 6 months or > 7 months
  3. b Among participants tested after birth