Table 1.

Results of the number of SSIs reported by NNIS compared to HIM among six educational hospitals under study in Tehran from March 2017 to March 2018

Hospital code	(a) HIM reported cases (n)	(b) NNIS reported cases (n)	(c) Common cases between two registries n (c/d%)	(d) Total number of cases (n) (a + b-c)	(e) Coverage of NNIS (b/d %)	(F) Coverage of HIM (a/d %)
Hospital 1	24	28	6 (13.04)	46	60.86	52.17
Hospital 2	6	6	0 (0)	12	50	50
Hospital 3	60	45	14 (15.38)	91	49.45	65.93
Hospital 4	42	6	2 (4.34)	46	13.04	91.30
Hospital 5	75	66	34 (31.77)	107	61.68	70.09
Hospital 6	55	90	45 (45)	100	90	55
Total	262	241	101 (25.12)	402	59.95	65.17