Fig. 1.Schematic shows sequence of application of search strings.
Total no. of cases of fractures = Fracture 1 + Fracture 2 + Fracture 3; total
no. of cases of "neither normal nor fracture" (NNNF) = NNNF 1 +
NNNF 2 + NNNF 3; total no. of cases with normal findings = Normal 1 + Normal
2.