Table 3: Standardized regression coefficients of background variables and performance ratios as predictors and academic achievements as the predicted variables.

Predicted variables
Language arts Mathematics
Predictors Grammar Written exp. Reading comp. Total Whole numbers Fractions Geometry Total
Block 1 (enter)
Sex - 0.006 0.552** - 0.088 0.155 0.104 - 0.113 - 0.057 - 0.038
Age 0.001 - 0.047 - 0.112 - 0.096 - 0.152 - 0.108 - 0.198 - 0.153
Dominant foot - 0.002 - 0.013 0.018 0.026 - 0.143 - 0.229a - 0.236* - 0.225
Physical activity - 0.140 - 0.094 - 0.144 - 0.142 - 0.087 - 0.142 - 0.167 - 0.143
Task order - 0.044 - 0.099 - 0.064 - 0.096 - 0.022 - 0.119 0.129 - 0.049
LD - 0.090 - 0.194 - 0.190 - 0.196 - 0.209 - 0.279* - 0.311* - 0.297*
Block 2 (stepwise)
Ratio Dyn. 2/1 0.256* 0.312* 0.304*
Ratio Dyn. 3/1
Ratio Stat. 2/1
Ratio Stat. 3/1 - 0.416** - 0.352** - 0.296*
Model R2 0.31 0.45 0.18 0.32 0.11 0.18 0.22 0.18
Model F 3.18 6.54 1.74 3.29 1.16 2.12 2.78 2.11
Model p 0.005 > 0.001 0.119 0.004 0.342 0.064 0.019 0.065

Note: LD: Learning disabilities; Written exp: written expression; Reading comp: Reading comprehension; *p < 0.05; **p < 0.01; ap < 0.06.