Graf method | FHC | |
---|---|---|
Normal 2nd ultrasound (with normal /abnormal AI at 6 months) | 287 (283/4) | 307 (306/1) |
Abnormal 2nd ultrasound (with normal /abnormal AI at 6 months) | 51 (33/18) | 31 (10/21) |
Sensitivitya (95%CI) | 82% (60–95%) | 95% (77–100%) |
Specificitya (95%CI) | 90% (86–93%) | 97% (94–98%) |
Positive predictive valuea (95%CI) | 35% (27–44%) | 68% (53–80%) |
Negative predictive valuea (95%CI) | 99% (97–99%) | 99% (98–100%) |