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Table 4 Proportion of agreement on the presence of ultrasound signs in the 5 common cases of ectopic pregnancy

From: Developing a knowledge base to support the annotation of ultrasound images of ectopic pregnancy

Sign annotations form the Ectopic Pregnancy Ontology Agreement (n) Lack of agreement (n) Images (n) Proportion of agreement (% and [95% CI])
Endometrial trilaminar pattern 48 12 4 80.00 [69.88 - 90.12]
Adnexal mass distinct from ovary 143 37 12 79.44 [73.54 - 85.34]
Embryo visible outside the uterine cavity 45 15 4 75.00 [64.04 - 85.96]
Gestational sac outside the uterine cavity 226 104 22 68.48 [63.47 - 73.49]
Adnexal mass adjacent to ovary 122 58 12 67.78 [60.95 - 74.61]
Gestational sac or trophoblast in a myometrial defect in previous caesarean section scar pregnancy site 119 76 13 61.03 [54.18 - 67.88]
Adnexal mass and corpus luteum at the same side 82 53 9 60.74 [52.50 - 68.98]
Adnexal rounded hyperechoic mass 63 57 8 52.50 [43.57 - 61.43]
Ring of fire sign 39 36 5 52.00 [40.69 - 63.31]
Yolk sac visible outside the uterine cavity 64 71 9 47.41 [38.99 - 55.83]
Adnexal mass as gestational sac with yolk sac 22 38 4 36.67 [24.48 - 48.86]
Caesarean section scar pregnancy peritrophoblastic blood flow 19 41 4 31.67 [19.90 - 43.44]
Intact endometrial midline echo 14 31 3 31.11 [17.58 - 44.64]
Tubal ring sign 45 120 11 27.27 [20.47 - 34.07]
Tubal ring without central identifying feature 24 66 6 26.67 [17.53 - 35.81]
Trophoblast visible outside the uterine cavity 110 325 29 25.29 [21.21 - 29.37]
Anterior distortion of uterus serosa 24 96 8 20.00 [12.84 - 27.16]
Smaller trophoblastic border distance to the anterior uterine serosa 33 162 13 16.92 [11.66 - 22.18]
Ectopic pregnancy wall more echogenic than corpus luteum wall 21 114 9 15.56 [9.45 - 21.67]
Fluid collection located centrally within the uterine cavity 4 41 2 13.33 [1.17 - 25.50]
Non intact endometrial midline echo 4 41 3 8.89 [0.57 - 17.21]
Gestational sac or trophoblast located at the level of internal cervical os 10 125 9 7.41 [2.99 - 11.83]
Gestational sac inside anterior myometrium and uterine cavity 1 44 3 2.22 [0.00 - 6.52]
Gestational sac located eccentricaly from uterine cavity 1 149 10 0.67 [0.00 - 1.98]
Total     40.35 [38.64 - 42.05]