Table I.

Baseline characteristics by age group

Age Group, YearsAll (n = 87)
2–4 (n = 35)5–7 (n = 11)8–10 (n = 25)18–25 (n = 16)
Gender, % female (no.)71.4 (25)54.6 (6)32.0 (8)50.0 (8)54.0 (47)
Ethnicity, % (no.)
 Bambara62.9 (22)27.3 (3)56.0 (14)68.8 (11)57.5 (50)
 Sarakole31.4 (11)72.7 (8)28.0 (7)25.0 (4)34.5 (30)
 Fulani2.9 (1)0.0 (0)12.0 (3)6.3 (1)5.7 (5)
 Malinke2.9 (1)0.0 (0)4.0 (1)0.0 (0)2.3 (2)
Hemoglobin AS, % (no.)a15.2 (5)0.0 (0)4.0 (1)12.5 (2)9.4 (8)
P. falciparum smear positive at enrollment, % (no.)b8.6 (3)18.2 (2)16.0 (4)12.5 (2)12.6 (11)
Parasitemia if smear positive at enrollment, parasites/μl (geometric mean (95% CI))952 (33–27,878)2,862 (155–52,838)426 (80–2,265)491 (0.31–765,982)770 (356–1,664)
GI helminth, % positive at enrollment (no.)c12.9 (4)18.2 (2)9.1 (2)0 (0)10.5 (8)
Urine schistosomiasis, % positive at enrollment (no.)d0 (0)0 (0)8.3 (2)41.7 (5)9.5 (7)
Distance lived from clinic, meters (mean ± SD)397.4 (±125)334 (±64)385 (±85)386 (±74)384 (±99)
Bed net use, % (no.)e29.0 (9)30.0 (7)16.7 (4)33.3 (5)28.7 (25)
  • a Data available for 85 subjects.

  • b All subjects were asymptomatic at enrollment.

  • c Data available for 76 subjects; GI = gastrointestinal.

  • d Data available for 74 subjects.

  • e Nightly bednet use self-reported at the end of the malaria season.