Table 3. Linear Regression Model of Potential Factors Associated With the Final Mathematics Score.
| Characteristic | Univariate Model Adjusted for Baseline Mathematics Score (n = 949) | Full Model (n = 949) | ||
|---|---|---|---|---|
| Regression Coefficient (95% CI)a | P Value | Regression Coefficient (95% CI) | P Value | |
| Early referral group | 0.22 (−0.05 to 0.50) | .10 | 0.25 (0.01 to 0.48)b | .04 |
| Male sex | 0.04 (−0.14 to 0.22) | .60 | 0.02 (−0.16 to 0.21) | .77 |
| Baseline standardized mathematics score | 0.53 (0.42 to 0.65)b | <.001 | 0.53 (0.42 to 0.63)b | <.001 |
| Distance between town and county seat | 0.00 (−0.01 to 0.02) | .34 | 0.01 (0.00 to 0.02) | .21 |
| Visual acuity of better eye | 0.32 (−0.36 to 0.42) | .86 | 0.10 (−0.37 to 0.57) | .64 |
| Owned eyeglasses at baseline | −0.04 (−0.22 to 0.14) | .60 | −0.09 (−0.30 to 0.12) | .36 |
| Boarding at school at baseline | 0.04 (−0.18 to 0.25) | .70 | 0.06 (−0.26 to 0.38) | .67 |
| One or both parents with ≥9 y of education | 0.12 (0.01 to 0.23)b | .04 | 0.13 (0.01 to 0.26)b | .03 |
| Both parents out-migrated for work | 0.0001 (−0.21 to 0.21) | .99 | 0.01 (−0.16 to 0.19) | .87 |
a
Except for the regression coefficient for baseline mathematics score (simple regression), coefficients for the different variables are for multiple models with the final mathematics score as dependent variable after adjustment for the baseline mathematics score.
b
Indicates comparisons for which the 95% CI for effect size does not cross zero.