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Table 1 Reliability analysis showing interobserver agreement in the measurements of different anatomical structures expressed as intraclass correlation coefficient (ICC).

From: Computed tomography measurements of different dimensions of maxillary and frontal sinuses

  ICC (95% CI) Random error, mm
  Right Left Right Left
Maxillary sinus:     
Craniocaudal diameter 0.88 (0.80-0.92) 0.87 (0.80-0.92) 2.4 2.5
A-P diameter 0.79 (0.68-0.87) 0.79 (0.67-0.87) 2.7 2.8
Anterior wall thickness 0.58 (0.38-0.73) 0.59 (0.39-0.73) 0.4 0.4
Frontal sinus:     
A-P diameter 0.80 (0.68-0.88) 0.86 (0.77-0.91) 2.1 1.8
Anterior wall thickness 0.84 (0.74-0.90) 0.87 (0.79-0.92) 0.5 0.4
Canine fossa:     
AP-diameter 0.73 (0.58-0.83) 0.75 (0.62-0.85) 2.6 2.7
Orbital floor:     
Thickness 0.50 (0.29-0.67) 0.57 (0.37-0.72) 0.3 0.3
  1. The table shows the random error of interobserver differences, expressed in millimeter.
  2. 95% CI indicates 95% confidence interval.
  3. A-P diameter indicates anteroposterior diameter (depth).