Table 2. Risk factors associated with recurrence in 32/48 patients with intradural chordoma or ecchordosis physaliphora.

	Recurrence (n = 5)	No recurrence (n = 27)	p value
Maximal diameter, cm	4.3 ± 0.5	3.1 ± 1.3	0.010
Age, y	46.0 ± 16.4	38.2 ± 19.0	0.381
Sex	1 male/4 females	17 males/8 females	0.130
Enhancement	5 yes/0 no	18 yes/7 no	0.355
Pathology	5 chordoma/0 EP	22 chordoma / 5 EP	0.284
Bony stalk	0 yes / 5 no	3 yes/24 no	0.424
Ki-67, %	5.12 ± 3.56	1.08% ± 1.88	0.004

Abbreviation: EP, ecchordosis physaliphora.