Table 1a

Characteristics of children in control and intervention schools at baseline: November 2010 (classes 1–6)

Control schoolsIntervention schools
Number of schools surveyed1919
Number of children surveyed954937
School-level characteristics:
 School size: mean no. of pupils (SD)205.1 (5.8)185.4 (4.2)
Mean prevalence of malaria (range)78.4% (54.0–94.1%)80.3% (52.0–92.0%)
Individual-level characteristics:
Mean age in years9.4 (2.3)9.5 (2.2)
 Proportion Female48.2% (460/954)48.7% (456/937)
 Nutritional status: height-for-age z-score−0.85 (1.23)−0.83 (1.48)
 Nutritional status: BMI-for-age z-score−0.68 (0.93)−0.61 (0.97)
 Father is literate*51.9% (374/721)53.9% (386/716)
 Mother is literate*20.1% (145/721)18.5% (133/720)
 Household has a moped*76.4% (539/706)83.9% (600/715)
 Household has a telephone*75.1% (527/702)78.8% (564/716)
 Child slept under a net night before survey*41.4% (296/715)41.9% (299/713)
Study endpoints at baseline: biomedical
 Prevalence of anaemia62.6% (580/927)63.2% (562/889)
 Mean haemoglobin concentration, g/L110.2 (13.1)110.4 (13.5)
Plasmodium infection:†
 Prevalence of malaria parasites: all species78.8% (685/869)80.7% (725/899)
 Parasite density per µL blood, all species in slide-positive children: geometric mean693.8 (99.5)492.0 (121.5)
 Prevalence of gametocytes: all species5.9% (51/869)4.8% (43/899)
  • Data are mean (SD), or % (n/N), unless specified otherwise.

  • *Data based on child report by schoolchildren surveyed in classes 3–6; questions were not asked of younger children in classes 1 and 2.

  • †For three schools, many blood slides were inadvertently destroyed (two controls and one intervention), resulting in missing data for Plasmodium infection.

  • BMI, body mass index.