Cognitive test performance relative to P gingivalis IgG
| Test | Overall (%) | P gingivalis IgG (EU) (95% CI) | p Value* |
| Immediate verbal memory/registration (9 possible points) | |||
| Low (0–4 points) | 5.7 | 164.3 (78.3–250.3) | 0.24 |
| High (5–9 points) | 113.6 (100.7–126.5) | ||
| Delayed verbal memory (9 possible points) | |||
| Low (0–3 points) | 6.9 | 155.3 (87.4–223.2) | 0.23 |
| High (4–9 points) | 114.6 (101.6–127.7) | ||
| Serial 3 subtraction test (5 possible points) | |||
| Low (0–4 points) | 22.1 | 132.3 (114.3–150.4) | 0.046 |
| High (5 points) | 114.8 (100.6–129.0) |
*p values derived from t test comparison of means of P gingivalis IgG by population characteristic.