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Table 1 Potential quantitative sonographic measurement predictors of early or late acetabular index normalization

From: Natural history of hip instability in infants (without subluxation or dislocation): a three year follow-up

Variable Prevalence OR 95% CI p Normalized before 7 months of age (group I), number of hips =17 Normalized after 7 months of age (group II), number of hips =31
     Median (mm) IQR (mm) Min-max (mm) Median (mm) IQR (mm) Min-max (mm)
LSCFaddMAD 0.355 0.15-0.823 0.016 4.35 1.7 3-7.2 3.8 1 2.3-5.6
LSCNmid 31.15 1.74-558.69 0.020 1.15 0.9 0.1-1.7 1.75 0.55 1.1-2.4
LSCFmad 0.36 0.13-1.00 0.050 3.75 1.2 1.8-5.5 3.4 0.80 1.9-4.1
LSCFaddBC 12113.82 0.70-2.09 0.059 0.57 0.1 0.42-0.64 0.63 0.11 0.49-0.73
LSCNmad 0.58 0.32-1.07 0.082 3.8 0.80 2.5-6.5 3.3 1.9 -0.1-6.3
FSCFΔsce 0.92 0.85-1.01 0.092 2 10 -11-14 -2 9 -28-12
FSCNα 1.00 088-1.14 0.966 59 5 55-68 59 6 49-69
LSCNα 0.96 0.86-1.08 0.526 64 7 51-79 65 6 56-72
FSCNbc 1.06 098-1.14 0.136 54.75 10.02 36.77-70.42 58.68 12.81 43.24-90.68
LSCNbc 8.72 0.01-16345.16 0.573 61.90 22.89 50.35-78.28 65.89 13.11 54.49-85.71
  1. Variable key: Time of measurement description (FS = first sonogram, LS = last sonogram) and code for measurement (see Additional file 1). OR = odds ratio, CI = confidence interval. All infants’ hips exhibited hip instability with stress and seated at rest with or without acetabular dysplasia on sonography. Normalization is radiographic AI ≤25°.