Table 1: Overall accuracy of HSG diagnosis compared to hysteroscopy and/or laparoscopy (gold standard)†.
| HSG | True positive | True negative | False positive | False negative | Sensitivity | Specificity | PPV | NPV | Accuracy | *P value |
| Congenital anomaly | 29 | 142 | 13 | 7 | 81 (78-91) | 92 (88-97) | 69 (58-77) | 95 (81-97) | 90 (78-92) | 0.07 |
| Uterine cavity filling defect | 81 | 107 | 4 | 6 | 93 (88-97) | 96 (79-96) | 95 (86-95) | 95 (84-99) | 95 (81-97) | < 0.03 |
| Uterine adhesion | 8 | 78 | 8 | 18 | 31 (28-37) | 91 (88-96) | 50 (41-57) | 81 (78-81) | 71 (68-71) | 0.13 |
| Hydrosalpinxes | 39 | 74 | 3 | 4 | 91 (81-91) | 96 (93-99) | 93 (79-93) | 95 (78-99) | 94 (90-94) | < 0.05 |
| Proximal tubal obstruction | 38 | 69 | 5 | 3 | 93 (90-94) | 93 (85-97) | 88 (80-99) | 96 (92-99) | 93 (88-96) | < 0.03 |
| distal tubal obstruction | 24 | 91 | 2 | 9 | 73 (67-77) | 90 (88-94) | 92 (76-97) | 91 (90-99) | 91 (89-98) | < 0.01 |
| Peri tubal adhesions | 12 | 86 | 12 | 7 | 63 (48-69) | 88 (83-88) | 50 (48-57) | 92 (88-97) | 84 (78-93 | 0.09 |
| Pelvic adhesions | 26 | 53 | 5 | 23 | 53 (39-77) | 91 (78-91) | 84 (68-90) | 70 (51-82) | 74 (68-87) | 0.22 |
†Complete Readings, Hysteroscopy N = 200, Laparoscopy N = 128.
Note: Sensitivity, Specificity, Positive Predictive Value (PPV), Negative Predictive Value (NPV), and Accuracy data are percentages. All numbers in parentheses are 95% CIs.
*Statistical significance was tested by McNemar's test.