Nasopharyngeal thickness using the adenoidal/nasopharyngeal ratio (Fujioka method). Adenoid measurement was made by drawing a perpendicular line from a line drawn along the straight part of the anterior margin of basiocciput (red line) to a point of maximal convexity of adenoid (yellow line). Nasopharyngeal measurement (blue line) was determined by drawing a line from the anterior inferior edge of sphenobasioccipital synchondrosis to the posterior superior margin of the hard palate. A/N Ratio was then determined by dividing adenoidal measurement with nasopharyngeal measurement.