The cervical vertebral angle changes pre - and post-intubation with the MGL was less than with the Macintosh laryngoscope at C3/4 ( 2.00 vs. 4.27 degrees , respectively ; p-value = 0.034 ) and the cumulative changes of all cervical spine levels ( 9.18 vs. 17.18 degrees , respectively ; p-value = 0.017 ) .