wbc      ag time 
 1   2300 present   65
 2    750 present  156
 3   4300 present  100
 4   2600 present  134
 5   6000 present   16
 6  10500 present  108
 7  10000 present  121
 8  17000 present    4
 9   5400 present   39
10   7000 present  143
11   9400 present   56
12  32000 present   26
13  35000 present   22
14 100000 present    1
15 100000 present    1
16  52000 present    5
17 100000 present   65
18   4400  absent   56
19   3000  absent   65
20   4000  absent   17
21   1500  absent    7
22   9000  absent   16
23   5300  absent   22
24  10000  absent    3
25  19000  absent    4
26  27000  absent    2
27  28000  absent    3
28  31000  absent    8
29  26000  absent    4
30  21000  absent    3
31  79000  absent   30
32 100000  absent    4
33 100000  absent   43