stage instit histol control case 
 1   1   1    1363   91
 2   1   1     816  117
 3   1   1     693  100
 4   1   1     307   60
 1   1   2      37    9
 2   1   2      25   14
 3   1   2      14   15
 4   1   2       7    9
 1   2   1      15    1
 2   2   1      11    2
 3   2   1      18    3
 4   2   1      23    3
 1   2   2      64   16
 2   2   2      51   33
 3   2   2      60   57
 4   2   2      13   41