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Table 3 Association of 2nd ultrasound with AI at age of six months in 338 hips

From: Association between early sonographic findings and acetabular index at the age of 6 months: a prospective observational study

 

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%)

  1. AI acetabular index, FHC femoral head coverage, CI confidence interval
  2. a Using acetabular index at age of 6 months as reference