id  study          year  ai    n1i   ci    n2i
1   Morton         1984  1     40    2     36
2   Rasmussen      1986  4     56    14    74
3   Smith          1986  2     92    7     93
4   Abraham        1987  1     48    1     46
5   Ceremuzynski   1989  1     25    3     23
6   Shechter       1990  1     50    9     53
7   Singh          1990  6     81    11    81
8   Feldstedt      1991  10   150    8     148
9   Shechter       1991  2     21    4     25
10  Woods          1992  90  1150    118   1150
11  Wu             1992  5    125    12    102
12  Thogersen      1995  4    130    8     122
13  Shechter       1995  4     96    17    98
14  ISIS-4         1995  2216 29011  2103  29039
15  Bhargava       1995  3     40    3     38
16  Urek           1996  1     31    0     30
17  Raghu          1999  6    169    18    181
18  MAGIC          2000  475 3113    472   3100
19  Gyamlani       2000  2     50    10    50
20  Santoro        2000  0     75    1     75
21  Zhu            2002  101 1691    134   1488
22  Nakashima      2004  1     89    3     91
