Sample year   1987 p 1995 p 1995 p 1987 Age group, years 50-60   50–60   60–70   60-70 ≤10 mm n=10 n.s. n=34 n.s. n=22 n.s. n=16   13.6%   19.0%   19.5%   13.3% 10–20 mm n=32 n.s. n=81 n.s. n=60 0.08 n=50   43.2%   45.3%   53.1%   41.7% >20 mm n=32 n.s. n=64 n.s. n=31 0.01 n=54   43.2%   35.7%   27.4%   45.0% Σ n=74   n=179   n=113   n=120   100%   100%   100%   100% n.s., not significant

Table 2: Distribution of three tumor size intervals of two age groups in 1995.