Table 1.

Correlation between tissue and serum in terms of percentage of cells staining positive for vascular endothelial growth factor (VEGF)

Cells showing VEGF expression	No.	Mean (pg/ml)	Standard deviation (pg/ml)	Standard error (pg/ml)	95 % confidence Interval for mean (pg/ml)
					Lower bound	Upper bound
<50 %	10	2,253.85	694.895	219.745	1,756.75	2,750.95
>50 %	10	7,005.99	3,240.477	1,024.729	4,687.89	9,324.09
Total	20	4,629.92	3,338.501	746.511	3,067.45	6,192.39