| Variables | Category | Mathematics course achievements | Crude POR (95% CI) | Adjusted POR (95% CI) | Poor | Medium | High |
| Maternal marital status | Married | 103 | 168 | 139 | 1 | 1 | Divorced | 17 | 19 | 14 | 0.70 (0.40, 1.21) | 0.91 (0.43, 1.93) | Separated | 7 | 14 | 12 | 1.16 (0.60, 2.23) | 1.28 (0.52, 3.12) | Widowed | 5 | 6 | 1 | 0.38 (0.13, 1.07) | 0.41 (0.12, 1.43) |
| Maternal education status | Illiterate | 68 | 103 | 66 | 1 | 1 | Primary | 45 | 58 | 46 | 1.04 (0.71, 1.52) | 0.80 (0.48, 1.34) | Secondary and above | 19 | 45 | 54 | 2.12 (1.10, 3.2) | 1.85 (0.98, 3.49) |
| Maternal occupation | Housewife | 85 | 146 | 99 | 1 | 1 | Employed | 25 | 22 | 35 | 1.26 (0.79, 2.00) | 0.88 (0.45, 1.72) | Private business | 7 | 21 | 19 | 1.65 (0.94, 2.88) | 0.88 (0.42, 1.85) | Other | 15 | 18 | 13 | 0.81 (0.46, 1.44) | 0.77 (0.33, 1.79) |
| Number of family living together | <2 | 18 | 18 | 10 | 1 | 1 | 3-5 | 73 | 124 | 110 | 2.05 (1.15, 3.67) | 1.60 (0.72, 3.53) | >5 | 41 | 65 | 46 | 1.66 (0.90, 3.06) | 1.94 (0.81, 4.64) |
| Residence | Urban | 104 | 145 | 148 | 1 | 1 | Rural | 28 | 62 | 18 | 0.62 (0.42, 0.91) | 0.59 (0.32, 1.07) |
| HH income | <550 | 75 | 114 | 62 | 1 | 1 | 550-2999 | 48 | 68 | 73 | 1.58 (1.11, 2.25) | 1.73 (1.06, 2.81) | >3000 | 9 | 25 | 31 | 2.60 (1.56, 4.36) | 1.39 (0.65, 2.95) |
| HH iodized salt use | Yes | 54 | 82 | 92 | 1 | 1 | No | 78 | 125 | 74 | 0.64 (0.46, 0.88) | 0.96 (0.60, 1.53) |
| Deworming | Yes | 99 | 166 | 135 | 1 | 1 | No | 33 | 41 | 31 | 0.77 (0.52, 1.15) | 0.61 (0.38, 1.04) |
| Does the child eat breakfast/lunch before school? | Yes | 113 | 187 | 151 | 1 | 1 | No | 19 | 20 | 15 | 0.68 (0.40, 1.15) | 1.29 (0.60, 2.77) |
| Does the child take special foods? | Yes | 16 | 38 | 45 | 1 | 1 | No | 116 | 169 | 121 | 0.50 (0.33, 0.76) | 0.85 (0.48, 1.49) |
| Regular study | Yes | 86 | 156 | 133 | 1 | 1 | No | 46 | 51 | 33 | 0.58 (0.40, 0.84) | 0.59 (0.36, 0.97) |
| Does the child like the school environment? | Yes | 121 | 201 | 160 | 1 | 1 | No | 10 | 6 | 6 | 0.51 (0.22, 1.16) | 0.99 (0.36, 2.73) |
| Under weight | Normal | 9 | 60 | 33 | 1 | 1 | Mild | 16 | 54 | 51 | 1.20 (0.74, 1.93) | 0.93 (0.49, 1.77) | Moderate | 40 | 21 | 29 | 0.41 (0.24, 0.71) | 0.34 (0.12, 0.92) | Severe | 15 | 9 | 10 | 0.39 (0.18, 0.83) | 0.66 (0.17, 2.58) |
| Stunting | Normal | 21 | 102 | 52 | 1 | 1 | Mild | 39 | 73 | 70 | 1.03 (0.71, 1.51) | 1.58 (0.91, 2.75) | Moderate | 55 | 26 | 38 | 0.45 (0.29, 0.70) | 0.63 (0.27, 1.49) | Severe | 17 | 6 | 6 | 0.23 (0.10 ,0.51) | 0.05 (0.004, 0.48) |
| Thinness | Normal | 34 | 102 | 65 | 1 | 1 | Mild | 44 | 55 | 56 | 0.86 (0.58, 1.26) | 1.33 (0.71, 2.47) | Moderate | 36 | 34 | 34 | 0.67 (0.43, 1.05) | 1.36 (0.58, 3.18) | Severe | 18 | 16 | 11 | 0.48 (0.26, 0.87) | 0.99 (0.33, 3.04) |
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