Table 3.
Comparison of WISC-IV test scores by sex for different age groupsa
| Girls | ||||
|---|---|---|---|---|
| Unadjusted analysis | Adjusted analysis | |||
| MD (95 % CI) | P | MD (95 % CI) | P | |
| Totalb | ||||
| FSIQ | −1.19 (-2.41,0.03) | 0.056 | −0.97 (-2.22,0.28) | 0.128 |
| VCI | −2.85 (-4.30,-1.41) | <0.001 | −2.44 (-3.94,-0.95) | 0.001 |
| WMI | 1.16 (0.01,2.30) | 0.048 | 1.32 (0.14,2.51) | 0.029 |
| PRI | −3.95 (-5.24,-2.67) | <0.001 | −3.68 (-5.01,-2.36) | <0.001 |
| PSI | 2.91 (1.67,4.14) | <0.001 | 3.10 (1.82,4.38) | <0.001 |
| 7 yc | ||||
| FSIQ | 0.88 (-1.76,3.51) | 0.513 | 0.01 (-2.63,2.64) | 0.996 |
| VCI | 0.24 (-2.71,-3.19) | 0.875 | 0.05 (-2.94,3.04) | 0.974 |
| WMI | 3.45 (0.94,5.96) | 0.007 | 2.99 (0.46,5.52) | 0.020 |
| PRI | −2.75 (-5.89,0.39) | 0.086 | −3.85 (-7.03,-0.67) | 0.018 |
| PSI | 5.24 (2.51,7.97) | <0.001 | 5.05 (2.32,7.77) | <0.001 |
| 8 yc | ||||
| FSIQ | −1.19 (-3.10,0.72) | 0.223 | −0.12 (-2.02,1.79) | 0.906 |
| VCI | −3.14 (-5.40,-0.88) | 0.006 | −2.39 (-4.67,-0.11) | 0.040 |
| WMI | 0.79 (-1.02,2.60) | 0.393 | 1.55 (-0.28,3.39) | 0.097 |
| PRI | −4.45 (-6.42,-2.89) | <0.001 | −3.09 (-5.09,-1.10) | 0.002 |
| PSI | 3.85 (1.83,5.86) | <0.001 | 4.43 (2.41,6.46) | <0.001 |
| 9 yc | ||||
| FSIQ | −1.69 (-3.93,0.55) | 0.140 | −1.92 (-4.12,0.29) | 0.088 |
| VCI | −3.84 (-6.56,-1.12) | 0.006 | −4.56 (-7.44,-1.67) | 0.002 |
| WMI | 1.11 (-0.93,3.15) | 0.285 | 0.78 (-1.39,2.96) | 0.481 |
| PRI | −2.71 (-4.95,-0.48) | 0.017 | −3.57 (-5.90,-1.23) | 0.003 |
| PSI | 0.24 (-1.87,2.35) | 0.824 | 0.07 (-2.02,2.16) | 0.947 |
| 10 yc | ||||
| FSIQ | −5.29 (-9.99,-0.60) | 0.027 | −4.91 (-9.56,-0.26) | 0.038 |
| VCI | −6.38 (-11.78,-0.98) | 0.021 | −6.34 (-11.99,-0.70) | 0.028 |
| WMI | −1.66 (-6.17,2.84) | 0.469 | −2.26 (-6.76,2.25) | 0.327 |
| PRI | −8.63 (-13.55,-3.71) | 0.001 | −6.79 (-11.81,-1.76) | 0.008 |
| PSI | 1.58 (-2.79,5.95) | 0.479 | 3.14 (-1.29,7.58) | 0.165 |
Abbreviation: MD mean difference, CI confidence interval, FSIQ full-scale intelligence quotient, VCI verbal comprehension index, WMI working memory index, PRI perceptual reasoning index, PSI processing speed index
aMultilevel models were used to assess the WISC-IV test scoresdifferences between boys and girls in early school aged children, with township to level 3, village to level 2, and individual to level 1
b P value adjusted for the age of children, household wealth index, maternal age, type of prenatal micronutrient supplementation, number of children in home, child school level, birth weight, gestational weeks, whether stunted or underweight children and lower respiratory tract infection in the last two weeks
c P value adjusted for the household wealth index, maternal age, type of prenatal micronutrient supplementation, number of children in home, child school level, birth weight, gestational weeks, whether stunted or underweight children and lower respiratory tract infection in the last two weeks