Table 3. Risk of Mental Disorders in Individuals With Positive Streptococcal Test Results, by Time Since the Last Positive Test Resulta.
| Time Since the Last 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] | 316 | 1 [Reference] | 522 | 1 [Reference] |
| <1 | 2482 | 1.09 (1.04-1.14)c | 57 | 1.38 (1.03-1.86)c | 128 | 1.17 (0.96-1.42) |
| 1-2 | 4094 | 1.19 (1.15-1.24)c | 96 | 1.30 (1.02-1.65)c | 263 | 1.34 (1.15-1.55)c |
| 3-5 | 4376 | 1.25 (1.20-1.30)c | 155 | 1.53 (1.24-1.89)c | 368 | 1.57 (1.37-1.79)c |
| 6-10 | 3596 | 1.19 (1.14-1.24)c | 202 | 1.67 (1.37-2.04)c | 213 | 1.19 (1.01-1.41)c |
| ≥11 | 860 | 1.17 (1.08-1.26)c | 46 | 1.57 (1.12-2.21)c | 21 | 1.17 (0.74-1.86) |
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].