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Table 1 Characteristics of the 959 children enrolled in the study of risk factors for anaemia in uncomplicated falciparum malaria

From: Factors contributing to anaemia after uncomplicated falciparum malaria in under five year-old Nigerian children ten years following adoption of artemisinin-based combination therapies as first-line antimalarials

Variables No. with enrolment haematocrit, n (%)a Enrolment haematocrit, mean [95% CI] Anaemia (haematocrit <30%) at presentation, n (%)a
ALL Mild Moderate Severe
Total 959 (96.7) 30.6 [30.3–30.9] 355 (37) 323 (33.7) 30 (3.1) 2 (0.2)
Male 522 (52.6) 30.5 [30.1–31] 197 (20.5) 182 (19) 14 (1.5) 1 (0.1)
Female 437 (44.1) 30.7 [30.2–31.2] 158 (16.5) 141 (14.7) 16 (1.6) 1 (0.1)
Agedb ≤ 15 months 121 (12.6) 29 [28.1–30] 56 (5.8) 48 (5) 8 (0.8) 0 (0)
 ≤ 24 months 256 (25.8) 29.7 [29.1–30.3] 108 (11.3) 93 (9.7) 14 (1.5) 1 (0.1)
 > 24 months 695 (70.1) 30.9 [30.6–31.2] 244 (25.4) 228 (23.8) 15 (1.6) 1 (0.1)
Asexual parasitaemiac
 ≤ 25,000 μL−1 559 (52.3) 30.6 [29.6–30.4] 225 (23.5) 203 (21.2) 20 (2.1) 2 (0.2)
 > 25,000–50,000 μL−1 141 (14.7) 31.2 [30.3–32.2] 41 (4.3) 35 (3.6) 6 (0.6) 0 (0)
 > 50,000–100,000 μL−1 152 (15.8) 31.3 [30.4–32.1] 52 (5.4) 50 (5.2) 2 (0.2) 0 (0)
 > 100,000 μL−1 101 (10.5) 31.4 [30.4–32.4] 35 (3.6) 33 (3.4) 2 (0.2) 0 (0)
Gametocytaemia
 Present 47 (4.7) 28.8 [27.6–30] 22 (2.3) 20 (2.1) 2 (0.2) 0 (0)
 Absent 912 (91.9) 30.7 [30.3–31] 333 (34.7) 303 (31.6) 28 (2.9) 2 (0.2)
Region of enrolment
 Eastern flankd 503 (50.7) 30.6 [30.1–31.1] 175 (18.2) 152 (15.8) 21 (2.2) 2 (0.2)
 Western flanke 456 (46) 30.6 [30.1–31] 180 (18.8) 171 (17.8) 9 (0.9) 0 (0)
  1. avalues in parenthesis are expressed as percentage of 992 children randomized
  2. bdata for age not available in eight children
  3. cdata for asexual parasitaemia not available in 6 children
  4. dEastern flank includes: Numan, Nena, Ogbia and Ogwa in Adamawa, Anambra, Bayelsa and Imo States, respectively
  5. eWestern flank includes: Kura, Ilorin, Ibadan and Bodinga in Kano, Kwara, Oyo and Sokoto States, respectively