Table 3.
Effect of treatment arms on endline standardized mathematics score, controlling for baseline score
| Intervention groups | No | Mean (SD) score | Unadjusted change in score (95% CI) | Adjusted* difference (95% CI) in endline score v control group | |
|---|---|---|---|---|---|
| Baseline | Endline | ||||
| Total | 3177 | 0.22 (0.99) | 0.34 (0.99) | 0.13 (0.08 to 0.17) | |
| Control | 1036 | 0.23 (1.01) | 0.29 (1.00) | 0.07 (−0.0002 to 0.14) | (reference) |
| Voucher | 988 | 0.14 (0.98) | 0.29 (0.98) | 0.15 (0.08 to 0.21) | 0.04 (−0.05 to 0.14) |
| Free glasses | 1153 | 0.28 (0.98) | 0.43 (0.97) | 0.16 (0.07 to 0.24) | 0.11 (0.01 to 0.21) |
| No education | 1529 | 0.15 (1.00) | 0.31 (1.01) | 0.16 (0.10 to 0.22) | (reference) |
| Education | 1648 | 0.27 (0.97) | 0.37 (0.96) | 0.10 (0.04 to 0.16) | −0.01 (−0.09 to 0.07) |
| Control: no education | 510 | 0.21 (1.04) | 0.27 (1.05) | 0.06 (−0.04 to 0.16) | (reference) |
| Control: education | 526 | 0.24 (0.98) | 0.32 (0.95) | 0.08 (−0.02 to 0.17) | 0.03 (−0.12 to 0.17) |
| Voucher: no education | 492 | 0.08 (0.97) | 0.29 (0.97) | 0.21 (0.12 to 0.30) | 0.10 (−0.03 to 0.23) |
| Voucher: education | 496 | 0.19 (0.98) | 0.28 (1.00) | 0.09 (−0.01 to 0.19) | 0.02 (−0.12 to 0.16) |
| Free glasses: no education | 527 | 0.17 (0.99) | 0.37 (1.00) | 0.19 (0.07 to 0.32) | 0.12 (−0.03 to 0.27) |
| Free glasses: education | 626 | 0.37 (0.95) | 0.49 (0.94) | 0.12 (0.01 to 0.24) | 0.13 (−0.01 to 0.27) |
Linear regression using endline math score as dependent variable.
*Adjusted for baseline score.