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Table 2: Differences in MRI measurements between 36 patients with IH and 36 controls^a
Diameter of the ONS (mm)^b Pituitary Height (mm) SOV Diameter (mm)
Position 1 Position 2 Position 3 Position 4
Patients with IH (all, n = 36) Mean 7.0 6.1 5.4 5.1 3.1 2.3
SD 0.9 0.9 1.0 0.7 1.6 0.7
95% CI 6.7–7.3 5.8–6.4 5.1–5.7 4.9–5.3 2.6–3.6 2.0–2.5
ICC 0.832 0.84 0.866 0.84 0.863 0.389
Patient subgroup I (n = 12) Mean 7.2 6.2 5.3 5.1 3.2 2.2
    CSF pressure 22–38 cm H₂O SD 0.6 0.7 1.1 0.5 1.0 0.8
Patient subgroup II (n = 10) Mean 6.7 5.9 5.2 5.1 2.8 2.4
    CSF pressure 40–70 cm H₂O SD 0.6 0.7 0.8 0.7 1.3 0.5
Patient subgroup III (n = 14) Mean 7.0 6.2 5.7 5.0 3.2 2.2
    No CSF pressure measurements SD 1.2 1.1 1.0 0.8 2.0 0.7
Controls (n = 36) Mean 5.8 4.9 4.4 4.1 5.2 1.7
SD 0.6 0.6 0.5 0.3 1.5 0.5
95% CI 5.6–6.0 4.7–5.1 4.3–4.6 4.0–4.3 4.7–5.6 1.5–1.8
ICC 0.76 0.728 0.78 0.732 0.893 0.634
a Results of all measurements differed significantly between all patients and controls (P < .01) and also between the different patient subgroups (I∼III) and controls (P < .05). No significant differences existed among results of patient subgroups I, II, and III.
b ONS diameter was measured 3, 6, 10, and 20 mm behind the globe (positions 1–4).