Table 3.

Univariate survival analysis and multivariate Cox regression analysis for type of surgery and age at initial diagnosis for different f/u groups

Postradiation Scan	Parameter		Number of Patients, Died/Total	Univariate Survival Analysis		Multivariate Cox Regression Analysis
				P, Log-Rank	Median, mo (95% CI)	Hazard Ratio (95% CI)	P
First f/u*	Age	≤ Median age	17/20	.585	16.6 (12.9–20.4)	1.2 (0.6–2.3)	.65
		> Median age	21/25		16.4 (10.8–22.0)
	Surgery	Gross total resection	21/23	.952	15.7 (11.7–19.6)	1.1 (0.6–2.2)	.76
		Subtotal resection/biopsy	17/22		17.0 (11.9–22.0)
	Progression	PsP	2/6	.03	29.9 (12.7–47.0)	3.0 (1.0–8.8)	.044
		True progression	40/45		14.3 (11.9–16.8)
Second f/u	Progression	PsP	2/2	NA	24.5 (23.5–25.5)	NA	NA
		True progression	14/15		14.0 (9.8–18.3)
Third f/u	Progression	PsP	0/1	NA	19.0	NA	NA
		True progression	6/8		20.1 (13.4–26.8)
Fourth f/u	Progression	PsP	0	NA	NA	NA	NA
		True progression	/78		21.3 (17.0–25.6)
First, second, third, and fourth f/u's cumulatively	Age	≤ Median age	34/41	.212	18.3 (15.5–21.1)	1.5 (0.9–2.5)	.102
		> Median age	33/38		16.1 (12.4–19.9)
	Surgery	Gross total resection	30/36	.52	19.1 (14.4–23.8)	1.4 (0.8–2.3)	.19
		Subtotal resection/biopsy	37/43		16.2 (13.7–18.9)
	Progression	PsP	6/9	.012	29.6 (16.5–42.6)	2.9 (1.2–6.8)	.014
		True progression	61/70		15.8 (13.8–17.7)

Abbreviation: NA, not applicable.

P-values below .05 are boldfaced.