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.