Table 2.
Test scores, follow-up groups
| Mean score (SD) | Mean Δ score pre-test → post-test | Mean Δ score post-test → retention-test | Mean Δ score pre-test → retention-test | |||
|---|---|---|---|---|---|---|
| Pre-test | Post-test | Retention-test | ||||
| Overall, N = 203 | 52.7 (16.8) | 68.4 (12.3) | 59.9 (8.6)* | 15.7 (p < 0.001) | −8.5 (p < 0.001) | 7.2 (p < 0.001) |
| Short follow-up, N = 63 | 53.9 (15.9) | 67.4 (12.3) | 60.2 (8.3) | 13.6 (p < 0.001) | −7.3 (p < 0.001) | 6.3 (p < 0.001) |
| Medium follow-up, N = 74 | 53.6 (17.6) | 71.4 (12.0) | 60.8 (8.9) | 17.8 (p < 0.001) | −10.6 (p < 0.001) | 7.2 (p < 0.001) |
| Long follow-up, N = 66 | 50.6 (16.8) | 66.1 (12.1) | 58.6 (8.6) | 15.4 (p < 0.001) | −7.4 (p < 0.001) | 8.0 (p < 0.001) |
*Pooled from follow-up intervals of all weeks (2–20 weeks).
The mean test scores and standard deviations of the pre-test, post-test and retention-test are reported for the overall number of participants and for each of the follow-up groups. The mean delta scores between pre-test and post-test, post-test and retention-test and pre-test and retention-test, respectively, are presented with associated p-values.