Table 2.

Tumours characterised by location–skull base or non-skull base (N = 199)

	Non-skull base (n = 145)		Skull base (n = 54)		P-valuea
	n	%	n	%
Hemisphere
Right	95	65.5	31	57.4	0.291
Left	50	34.5	23	42.6	0.291
Tumour Size (cm)/volume (cm3) d
Largest diameter (mean, SD)	4.79 (1.368)		4.76 (1.17)		0.430b
Pre-surgery volume (mean, SD)	51.4 (19.15)		51.4 (19.4)		0.989b
Post-surgery volume (mean, SD)	0.707 (3.08)		5.278 (6.65)		< 0.001b
Radiological featurese
Presence of calcification	39	26.9	16	29.6	0.701
Presence of oedema	130	89.7	51	94.4	0.295
Presence of hyperotosis	90	62.1	30	55.6	0.404
WHO grading
Grade I	142	98	52	96.3	0.614c
Grade 2	3	2	2	3.7	0.614c
Duration of surgery in hours (mean, SD)	4.4 (1.01)		7.68 (1.21)		< 0.001b
Simpsons grading
1	96	66.2	2	3.7	< 0.001
2	27	18.6	7	13
3	11	7.59	10	18.5
4	11	7.59	35	64.8
Complete resection (Simpsons 1–3) f	134	87.6	19	12.4	< 0.001
Incomplete resection (Simpsons 4) f	11	23.9	35	76.1	< 0.001

^aChi-square test

^bIndependent t-test

^cFisher Exact test

^dVolume calculation as quoted in Ishi et al. (12)

^eradiological feature as quoted in Ben Nsir et al. (13)

^fSimpson grade of resection and corresponding EORTC/RTOG definitions of extent of resection as quoted in Jenkinson et al. (14)