TABLE 5.
Levels of antibodies against B. forsythus and P. intermedia corrected for total Ig levels
| Sample | No. of samples | Mean (SD) ratio (105) of IgG level/total IgG level
|
Mean (SD) ratio (105) of IgA level/total IgA level
|
||
|---|---|---|---|---|---|
| B. forsythus | P. intermedia | B. forsythus | P. intermedia | ||
| RA serum | 116 | 15.7a (12.4) | 8.90b (5.5) | 20.6a (23.0) | Not detectablec |
| Control plasma | 100 | 28.3 (23.2) | 12.4 (11.1) | 28.9 (22.0) | Not detectable |
| RA-SF | 52 | 18.3 (14.4) | 10.3 (6.7) | 22.2b (16.6) | Not detectable |
| Non-RA-SF | 43 | 19.7 (17.5) | 11.3 (7.9) | 40.1 (39.5) | Not detectable |
| OA-SF | 9 | 11.7 (5.0) | 11.8 (5.9) | 32.4 (12.8) | Not detectable |
a
P < 0.0001 for differences in antibody levels between the patient group (RA serum) and the CTR group (CTR plasma) and between RA-SF, non-RA-SF, and OA-SF samples calculated by the Mann-Whitney U test.
b
P < 0.05 for differences in antibody levels between the patient group (RA serum) and the CTR group (CTR plasma) and between RA-SF, non-RA-SF, and OA-SF samples calculated by the Mann-Whitney U test.
c
Not detectable, values less than the lowest standard value used.