Table 5.

The detection rate of foreign bodies by plain radiographies and computed tomography (CT).

	Positive plain radiographies	Negative plain radiographies	Positive CT findings	Negative CT findings	Neither plain X-ray nor CT was done	Total
Scope (+) for foreign bodies	44	87	34	4	31	168
Scope (−) for foreign bodies	13	35	6	12	8	58
Overall	57	122	40	16	39	226

The plain radiographies detection rate (sensitivity) for foreign bodies: 33.3% (44/131).

The CT detection rate (sensitivity) for foreign bodies: 89.4% (34/38).

The positive predictive value of plain radiographies: 77.1% (44/57).

The positive predictive value of CT: 85% (34/40).

CT: computed tomography.