a trend toward significancep = 0.09
There was a trend toward significance in the number of disk spaces treated, with older patients being treated at more than one space (22% younger vs. 39% older patients, p = 0.09), and in having a longer length of stay (LOS) (4.6 ± 1.9 younger vs. 5.3 ± 1.8 older, p = 0.08).