Table 4. Risk of Mental Disorders in Individuals With Positive Streptococcal Test Results, by Age at the First Positive Testa.
| Age at the First Positive Streptococcal Test, y | Any Mental Disorder | OCD | Tic Disorders | |||
|---|---|---|---|---|---|---|
| No. | IRRb (95% CI) | No. | IRRb (95% CI) | No. | IRRb (95% CI) | |
| No test performed | 13 712 | 1 [Reference] | 206 | 1 [Reference] | 522 | 1 [Reference] |
| 0-2 | 4666 | 1.14 (1.10-1.18)c | 113 | 1.47 (1.17-1.85)c | 258 | 1.23 (1.06-1.42)c |
| 3-11 | 9889 | 1.19 (1.15-1.22)c | 417 | 1.55 (1.30-1.83)c | 723 | 1.41 (1.25-1.58)c |
| ≥12 | 853 | 1.73 (1.60-1.86)c | 26 | 1.12 (0.73-1.71) | 12 | 1.18 (0.65-2.14) |
Abbreviations: IRR, incidence rate ratio; OCD, obsessive-compulsive disorder.
a
The streptococcal test was the rapid antigen diagnostic test for group A β-hemolytic streptococcal throat infections.
b
Adjusted for sex, age, and calendar year.
c
The reference interval did not include 1 [Reference].