Table 3.

Age-related risk for dural lesion

	Odds ratio	p value
≤50	0.48	0.053
51–60	0.40	0.002
61–70	0.56	0.027
71–80	0.83	0.455

The figures given in the table relate the Odds ratio and the p value for each age group when compared with patients >80 years of age. The Odds ratio 0.40 means that patients aged 51–60 years have a 40% risk of that of patients aged over 80 years