Interrater reliability of the ovarian–adnexal reporting and data system magnetic resonance imaging (O‑RADS MRI)

Ramadan, Zainab A; Abdelrazek, Ahmed Abdel Khalek; Denewar, Fatmaelzahraa Abdelfattah

doi:10.1186/s43055-023-01174-y

Egyptian Journal of Radiology and Nuclear Medicine

Table 2 Inter-rater agreement of findings of pelvic lesions of O-RADS

From: Interrater reliability of the ovarian–adnexal reporting and data system magnetic resonance imaging (O‑RADS MRI)

MRI criterion	Observer 1	Observer 2	Kappa	95% CI	P value	Agreement percentage
Laterality
Right	64	61	0.918	0.854–0.982	< 0.001*	95.42
Left	58	63
Bilateral	9	7
Locularity
Uni-locular	52	54	0.936	0.874–0.998	< 0.001*	96.9
Bi or multi locular	79	77	0.936	0.874–0.998	< 0.001*	96.9
Purely cystic
Yes	49	54	0.920	0.852–0.989	< 0.001*	96.18
No	82	77	0.920	0.852–0.989	< 0.001*	96.18
Purely fatty
Yes	1	2	0.663	0.044–1.0	< 0.001*	99.24
No	130	129	0.663	0.044–1.0	< 0.001*	99.24
Purely endometriotic
Yes	14	12	0.915	0.798–1.0	< 0.001*	98.5
No	117	119	0.915	0.798–1.0	< 0.001*	98.5
Absence of wall enhancement	n = 73	n = 73
No enhancement	14	13	0.876	0.781–0.971	< 0.001*	91.7
Present	59	60	0.876	0.781–0.971	< 0.001*	91.7
Grouped thickened septae
Yes	64	60	0.903	0.837–0.980	< 0.001*	95.42
No	67	71	0.903	0.837–0.980	< 0.001*	95.42
Thickened regular septae
Yes	57	52	0.922	0.854–0.989	< 0.001*	96.18
No	74	79	0.922	0.854–0.989	< 0.001*	96.18
Thickened irregular septae
Yes	43	38	0.911	0.834–0.987	< 0.001*	96.18
No	88	93	0.911	0.834–0.987	< 0.001*	96.18
Vegetations
Yes	31	32	0.979	0.938–1.0	< 0.001*	99.24
No	100	99	0.979	0.938–1.0	< 0.001*	99.24
Solid tissue
Yes	31	32	0.979	0.938–1.0	< 0.001*	99.24
No	100	99	0.979	0.938–1.0	< 0.001*	99.24
Purely solid
Yes	10	10	1.0	1.0–1.0	< 0.001*	100.0
No	121	121	1.0	1.0–1.0	< 0.001*	100.0
Pattern of enhancement of solid lesions relative to myometrium	N = 73	N = 73
Low risk	27	29	0.876	0.781–0.971	< 0.001*	91.7
Intermediate risk	23	23
High risk	23	21
Low T2 signal of solid part
Yes	45	39	0.893	0.810–0.976	< 0.001*	95.4
No	86	92	0.893	0.810–0.976	< 0.001*	95.4
Low b 1000 signal
Yes	43	40	0.874	0.784–0.965	< 0.001*	94.57
No	88	91	0.874	0.784–0.965	< 0.001*	94.57
Peritoneal fluid
Present	66	65	0.985	0.955–1.0	< 0.001*	99.24
Absent	65	66	0.985	0.955–1.0	< 0.001*	99.24
Peritoneal implant
Present	15	15	1.0	1.0–1.0	< 0.001*	100.0
Absent	116	116	1.0	1.0–1.0	< 0.001*	100.0

*indicates that the related P value is statistically significant

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