TABLE 2:

Proportion (and 95% confidence interval) of emergency departments with sufficient volumes of children to be able to detect a number needed to harm of 10. A number needed to harm of 10 indicates that one additional child would experience misdiagnosis compared with a reference misdiagnosis rate derived from all emergency departments.

Serious condition	n (%, 95% CI)
All conditions	614 (13.6%, 11.5–15.9)
Appendicitis	530 (11.7%, 9.8–14.0)
Complicated pneumonia	33 (0.7%, 0.3–1.5)
Testicular torsion	29 (0.6%, 0.2–1.4)
Intussusception	25 (0.6%, 0.2–1.2)
Each other condition*	0 (0.0%, 0.0–0.4)

^*Atraumatic cranial hemorrhage, bacterial meningitis, compartment syndrome, craniospinal abscess, deep neck infection, ectopic pregnancy, encephalitis, Kawasaki disease, mastoiditis, myocarditis, necrotizing fasciitis, orbital cellulitis, osteomyelitis, ovarian torsion, pulmonary embolism, pyloric stenosis, septic arthritis, sinus venous thrombosis, slipped capital femoral epiphysis, and stroke