# Table 1 Bivariate and multivariate analysis of independent variables with the school performance in Portuguese language or mathematics in a cohort of 198 children followed from March to November 2008, in two schools from an endemic area for malaria (Careiro, Amazonas, Brazil).

Poor performance in language and/or mathematics
Yes n (%) No n (%) Crude Odds Ratio (95% CI) p Adjusted Odds Ratio (95% CI)* p
Sex Male 49 (52.1) 56 (53.8)     -
Female 45 (47.9) 48 (46.2)
Age 6-10 years 54 (57.4) 48 (46.2) 0.64 (0.36-1.11) 0.112 1.70 (0.94-3.04) 0.077
11-14 years 40 (42.6) 56 (53.8)
At risk of or with malnutrition**   16 (17.0) 11 (14.5) 1.21 (0.53-2.79) 0.651 - -
Mother's education < 5 years 59 (62.8) 80 (76.9) 1.98 (1.02-3.85) 0.030 0.56 (0.30-1.06) 0.076
≥ 5 years 35 (37.2) 24 (23.1)
Time living in the study area < 5 years 70 (74.5) 78 (75.0) 1.03 (0.54-1.95) 0.931 0.96 (0.49-1.90) 0.906
≥ 5 years 24 (25.5) 26 (25.0)
Anaemia# at enrollment**   21 (25.0) 23 (24.0) 1.06 (0.54-2.09) 0.871 - -
School absenteeism throughout the follow-up interval Until 1 week 62 (66.0) 64 (61.5) 0.83 (0.46-1.48) 0.519 1.20 (0.65-2.20) 0.559
> 1 week 32 (34.9) 40 (38.5)
≥ 1 malarial attacks during the follow-up   41 (43.6) 29 (27.9) 2.00 (1.11-3.62) 0.021 1.91 (1.04-3.54) 0.039
Total   94 (100) 104 (100) - - - -
1. * Logistic regression model using age, mother's education, time living in the study area, school absenteeism and malarial attacks as independent variables
2. ** n = 170
3. # Hb < 11,0 g/dL