TABLE 3.
Levels of specific IgA antibodies against P. gingivalis, P. intermedia, and B. forsythus in RA and CTR sera
| Sample | No. of samples | Mean (SD) IgA level (μg/ml)
|
Mean (SD) total IgA level (mg/ml) | ||
|---|---|---|---|---|---|
| P. gingivalis | P. intermedia | B. forsythus | |||
| RA-serum | 116 | 0.169 (0.176) | Not detectablea | 0.349b (0.275) | 2.33 (1.50) |
| CTR | 100 | 0.129 (0.121) | Not detectable | 0.532 (0.390) | 2.28 (2.06) |
a
Not detectable, values less than the lowest standard value used.
b
P < 0.0001 for differences in antibody levels between the patient group (RA serum) and the CTR group (CTR plasma) calculated by the Mann-Whitney U test.