| Variables | Category | Science course achievements | Crude POR (95% CI) | Adjusted POR (95% CI) | Poor | Medium | High |
| Maternal marital status | Married | 57 | 184 | 169 | 1 | 1 | Divorced | 16 | 16 | 18 | 0.55 (0.31, 0.99) | 0.85 (0.39, 1.87) | Separated | 4 | 14 | 15 | 1.18 (0.60, 2.31) | 1.77 (0.70, 4.52) | Widowed | 3 | 6 | 3 | 0.49 (0.17, 1.43) | 0.67 (0.19, 2.35) |
| Residence | Urban | 62 | 155 | 180 | 1 | 1 | Rural | 18 | 65 | 25 | 0.52 (0.35, 0.77) | 0.48 (0.26, 0.90) |
| Maternal education status | Illiterate | 41 | 114 | 82 | 1 | 1 | Primary | 26 | 63 | 60 | 1.18 (0.80, 1.73) | 1.23 (0.73, 2.08) | Secondary and above | 13 | 43 | 62 | 1.98 (1.29, 3.03) | 1.34 (0.71, 2.54) |
| Maternal occupation | Housewife | 48 | 158 | 124 | 1 | 1 | Employed | 15 | 26 | 41 | 1.36 (0.85, 2.18) | 1.09 (0.55, 2.15) | Private business | 7 | 16 | 24 | 1.51 (0.83, 2.73) | 0.91 (0.42, 1.97) | Other | 10 | 20 | 16 | 0.79 (0.44, 1.41) | 0.69 (0.29, 1.65) |
| Number of family living together | < 2 | 12 | 20 | 14 | 1 | 1 | 3-5 | 46 | 131 | 130 | 1.83 (1.01, 3.29) | 1.04 (0.47, 2.30) | >5 | 22 | 69 | 61 | 1.73 (0.92, 3.30) | 1.74 (0.73, 4.15) |
| HH income | <550 | 47 | 124 | 80 | 1 | 1 | 550-2999 | 27 | 76 | 86 | 1.65 (1.15, 2.37) | 1.67 (1.02, 2.75) | >3000 | 6 | 20 | 39 | 2.98 (1.73, 5.13) | 1.29 (0.59, 2.83) |
| HH iodized salt use | Yes | 36 | 81 | 111 | 1 | 1 | No | 44 | 139 | 94 | 0.64 (0.46, 0.89) | 0.71 (0.44, 1.14) |
| Does the child take special foods? | Yes | 11 | 34 | 54 | 1 | 1 | No | 69 | 186 | 151 | 0.51 (0.33, 0.79) | 0.92 (0.51, 1.66) |
| Sick with diarrhea | Yes | 22 | 60 | 42 | 1 | 1 | No | 58 | 160 | 163 | 1.37 (0.94, 2.00) | 1.40 (0.84, 2.33) |
| Regular study | Yes | 54 | 164 | 157 | 1 | 1 | No | 26 | 56 | 48 | 0.76 (0.52, 1.12) | 0.65 (0.39, 1.08) | No | 42 | 69 | 52 | 0.49 (0.34, 0.71) | 0.70 (0.41, 1.20) |
| Does the child like the school environment? | Yes | 74 | 207 | 201 | 1 | 1 | No | 6 | 12 | 4 | 0.40 (0.18, 0.88) | 0.46 (0.17, 1.21) |
| Under weight | Normal | 6 | 55 | 41 | 1 | 1 | Mild | 8 | 52 | 61 | 1.37 (0.83, 2.25) | 0.85 (0.44, 1.66) | Moderate | 24 | 35 | 31 | 0.51 (0.30, 0.89) | 0.32 (0.12, 0.89) | Severe | 9 | 16 | 9 | 0.41 (0.19, 0.86) | 0.59 (0.15, 2.33) |
| Stunting | Normal | 15 | 89 | 71 | 1 | 1 | Mild | 15 | 81 | 86 | 1.23 (0.84, 1.82) | 1.68 (0.95, 2.98) | Moderate | 36 | 44 | 39 | 0.48 (0.30, 0.75) | 0.64 (0.27, 1.53) | Severe | 14 | 6 | 9 | 0.25 (0.11, 0.57) | 0.10 (0.02, 0.61) |
| Thinness | Normal | 21 | 101 | 79 | 1 | 1 | Mild | 25 | 58 | 72 | 1.11 (0.75, 1.65) | 1.75 (0.92, 3.31) | Moderate | 23 | 37 | 44 | 0.85 (0.54, 1.34) | 1.95 (0.83, 4.58) | Severe | 11 | 24 | 10 | 0.46 (0.25, 0.83) | 0.60 (0.38, 1.89) |
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