Figure 2: A) A two-dimensional scatter-plot is shown for the control 1987 sample analysis of age against tumors size. A widely dispersed plot is found and linear regression revealed a straight line (r = 0.07 p = 0.32 n = 231). B) In the 1997/98 sample, a two-dimensional scatter-plot based on the 1997/98 sample included unscreened subjects younger than 50 years, to demonstrate the screening effect. Analyzing age against tumor size showed a significant negative slope along with increasing age (r =-0.20 p<=0.005 n = 223). The plot reveals the delayed effect in reduction of tumors size from the start of screening at the age of 50 years up to 65 years.