Table 2.

Comparison of the performance of each contact tracing method and the methods combined.

Variable	RTLSa method			Conventional method			Both methodsb
	Detected	Not detected	Detected		Not detected	Detected		Not detected
Identified contact cases (N=1088), n (%)	653 (60.0)	435 (40.0)	509 (46.8)		579 (53.2)	74 (6.8)		1,014 (93.2)
Secondary transmission (N=76), n (%)	53 (69.7)	23 (30.3)	27 (35.5)		49 (64.5)	4 (5.3)		72 (94.7)
Secondary transmission ratec, %	8.1	N/Ad	5.3		N/A	5.4		N/A

^aRTLS: real-time locating system.

^b“Both methods” denotes cases identified by both the RTLS and conventional methods.

^cSecondary transmission rate was defined as cases of secondary transmission against contact cases identified by each method.

^dN/A: not applicable.