TABLE 5.

Summary of PED physician outcome before and after results of the Strep A OIA were available^a

Outcome	No. of patients
	Pretest therapeutic accuracy	Posttest therapeutic accuracy
Desired outcomeb	177	231
Adverse outcomec	99	45
Total	276	276

^aWe applied the chi-square test with Yates’ continuity correction to test the hypothesis that the Strep A OIA had a significant impact on outcomes. We can reject the null hypothesis of no impact at the 99% confidence level. 

^bDefined as no antibiotic for patients with cultures negative for GABHS or 10 days of therapy for patients with cultures positive for GABHS. 

^cDefined as any antibiotic for patients with cultures negative for GABHS or no therapy or 2 days of therapy for patients with cultures positive for GABHS.