| Control | Intervention group | t test | Control | Intervention group | t test |
---|---|---|---|---|---|---|
 | group (pre test) n = 106 | (pre test) n = 111 | p value control vs. intervention (pre test) | group (post test) n = 106 | (post test) n = 111 | p value control vs. intervention (post test) |
Mean number of correct responses per participant | 19.0 (95% CI: 17.8–20.1) SD: 5.4 | 18.1 (95% CI: 16.9–19.2) SD: 5.8 | P = 0.19 | 20.0 (95% CI: 18.9–21.0) SD: 5.2 | 27.0 (95% CI: 25.9–28.1) SD: 5.5 | P < 0.001 |
Mean number of incorrect responses per participant | 8.6 (95% CI: 7.5–9.7) SD: 5.0 | 9.4 (95% CI: 8.2–10.5) SD: 4.8 | P = 0.27 | 7.7 (95% CI: 6.6–8.7) SD: 4.6 | 8.3 (95% CI: 7.4–9.4) SD: 4.6 | P = 0.35 |
Mean number of "unsure" responses per participant | 9.3 (95% CI: 8.2–10.4) SD: 6.7 | 9.6 (95% CI: 8.5–10.7) SD: 7.3 | P = 0.78 | 9.4 (95% CI: 8.3–10.5) SD: 6.7 | 1.8 (95% CI: 1.2–2.3)" SD: 3.0 | P < 0.001 |