| Code | Definition | Number of Accessions |
| 1 | medium - typical size for most cotton cultivars (golf ball size) | 4580 |
| 2 | large - larger than typical boll size, larger than golf ball size. May also be longer than normal | 502 |
| 3 | small - smaller than typical size in most cotton cultivars. Best seen in a number of G. herbaceum | 333 |
| 4 | extra small - typical for most of the exotic species, (marble size or smaller) | 14 |
| 9 | plot is segregating for this trait and a single score is not an accurate description or the variation is outside of the rating scale | 16 |