TABLE 2.
Outcome in OPA stratified by age groupa
| Age group (yr) | No. of patients | No. (%) of individuals with: |
||||
|---|---|---|---|---|---|---|
| An acute-phase serum OPA titer of: |
A convalescent-phase serum OPA titer that was: |
|||||
| >1 | 1 | Increased | Unchanged | Decreased or undetectable | ||
| <50 | 10 | 5 (50) | 5 (50) | 7 (70) | 1 (10) | 2 (20) |
| 50–59 | 10 | 2 (20) | 8 (80) | 4 (40) | 1 (10) | 5 (50) |
| 60–69 | 8 | 4 (50) | 4 (50) | 5 (63) | 0 | 3 (38) |
| 70–79 | 13 | 7 (54) | 6 (46) | 6 (46) | 4 (31) | 3 (23) |
| ≥ 80 | 13 | 10 (77) | 3 (23) | 2 (15) | 5 (38) | 6 (46) |
| P | 0.12 | 0.083b | ||||
a
To further investigate if there was an association between patient age and outcome as determined by an OPA performed with corresponding patient sera, the OPA results were compared between age groups.
b
The chi-square test was performed with dichotomous outcome variables by pooling the “unchanged” and “decreased or undetectable” groups.