Table 2.

Site-specific prevalences and performance characteristics of the cobas^® 4800 CT/NG test

Chlamydia trachomatis
	TOH	IWA	YOS	IES	MIY	HAR	NIS	KAW	ITO	Overall
No. of subjects	345	32	178	120	45	14	17	50	29	830
Prevalence (%) C. trachomatis	8	25	8	11	44	29	47	42	34	15
Sensitivity (%)	100	100	100	100	100	100	100	100	100	100
Specificity (%)	100	96	100	100	100	100	89	100	95	100
PPV (%)	100	89	100	100	100	100	89	100	91	98
NPV (%)	100	96	100	100	100	100	89	100	95	100
Neisseria gonorrhoeae
	TOH	IWA	YOS	IES	MIY	HAR	NIS	KAW	ITO	Overall
No. of subjects	345	32	178	120	45	14	17	50	29	830
Prevalence (%) N. gonorrhoeae	1	13	2	0	16	36	35	22	38	6
Sensitivity (%)	100	100	100	n.c.	100	100	100	100	100	100
Specificity (%)	100	100	100	100	100	100	100	100	100	100
PPV (%)	100	100	100	n.c.	100	100	100	100	100	100
NPV (%)	100	100	100	100	100	100	100	100	100	100
TOH, Toho Obstetrics & Gynecology Hospital; IWA, Iwasawa Clinic; YOS, Yoshio Clinic; IES, Iesaka Clinic; MIY, Miyamotochou Chuo Clinic; HAR, Hara Genitourinary Hospital; NIS, Nishimura Urology Clinic; KAW, Kawai Urology Clinic; ITO, Ito Clinic. n.c., not calculated due to zero value for N. gonorrhoeae.