From: On the global CRISPR array behavior in class I systems
 | Mean | 1st Quart | Median | 3rd Quart |  | Systems |
---|---|---|---|---|---|---|
Class 1 | 40 | 12 | 25 | 51 | 481 | 811 |
Type I | 41 | 12 | 26 | 52 | 481 | 708 |
B | 54 | 17 | 36 | 68 | 481 | 188 |
C | 43 | 16 | 30 | 56 | 318 | 164 |
E | 30 | 11 | 19 | 37 | 239 | 226 |
F | 33 | 5 | 14 | 52 | 248 | 91 |
Type III | 33 | 9 | 22 | 31 | 276 | 103 |