| Group/Moment | Comparisons | Mean Difference | S.E. | df | p | 95% CI | |
| Lower | Upper | ||||||
| 2 days of lectures 1 month apart | Baseline - 12 months | −0.003 | 0.004 | 1 | >0.999 | −0.017 | 0.010 |
| 2 days of lectures 2 months apart | Baseline - 12 months | −0.008 | 0.004 | 1 | >0.999 | −0.021 | 0.005 |
| 2 days of lectures 3 months apart | Baseline - 12 months | 0.011 | 0.004 | 1 | 0.339 | −0.003 | 0.024 |
| No classroom intervention | Baseline - 12 months | −0.012 | 0.004 | 1 | 0.163 | −0.025 | 0.002 |
| Baseline | Lectures 1 month apart - Lectures 2 months apart | −0.011 | 0.018 | 1 | >0.999 | −0.066 | 0.045 |
| Lectures 1 month apart - Lectures 3 months apart | −0.027 | 0.018 | 1 | >0.999 | −0.082 | 0.029 | |
| Lectures 1 month apart - no classroom intervention | −0.015 | 0.018 | 1 | >0.999 | −0.071 | 0.041 | |
| Lectures 2 months apart - Lectures 3 months apart | −0.016 | 0.018 | 1 | >0.999 | −0.072 | 0.040 | |
| Lectures 2 months apart - no classroom intervention | −0.005 | 0.018 | 1 | >0.999 | −0.061 | 0.051 | |
| Lectures 3 months apart - no classroom intervention | 0.011 | 0.018 | 1 | >0.999 | −0.045 | 0.068 | |
| 12 Months | Lectures 1 month apart - Lectures 2 months apart | −0.015 | 0.018 | 1 | >0.999 | −0.071 | 0.040 |
| Lectures 1 month apart - Lectures 3 months apart | −0.013 | 0.018 | 1 | >0.999 | −0.068 | 0.043 | |
| Lectures 1 month apart - no classroom intervention | −0.024 | 0.018 | 1 | >0.999 | −0.080 | 0.032 | |
| Lectures 2 months apart - Lectures 3 months apart | 0.003 | 0.018 | 1 | >0.999 | −0.053 | 0.058 | |
| Lectures 2 months apart - no classroom intervention | −0.008 | 0.018 | 1 | >0.999 | −0.064 | 0.048 | |
| Lectures 3 months apart - no classroom intervention | −0.011 | 0.018 | 1 | >0.999 | −0.067 | 0.045 | |