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. 2017 Jul 5;74(7):740–746. doi: 10.1001/jamapsychiatry.2017.0995

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].