Fig. 2

Comparison of the POGO (percentage of glottic opening) scores. A Solid line (—): Neutral position increased POGO score compare to Sniffing position (n = 31); a dot line (−-): decreased POGO score (n = 13); a grey line: no changes in POGO score (n = 9). The mean of difference of POGO score was 11.09, higher for the neutral position and standard deviation was 23.73 (p = 0.002). Neutral position significantly increased the number of patients with increased POGO score compare to sniffing position (p = 0.017)