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Response rates for the data collections
| Data collection | Control group, % | Treatment group, % | P value |
| Pretest, writing | 78.9 | 81.6 | 0.18 |
| Writing test, 8 mo | 74.6 | 69.5 | 0.02 |
| Reading test, 3 mo | 82.3 | 78.4 | 0.05 |
| Reading test, 7 mo | 94.2 | 94.5 | 0.80 |
| Presurvey, parents* | 47.1 | 56.5 | 0.00 |
Parents who responded to all of the beliefs questions are classified as responding to the presurvey (n = 1,587).
