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Estimated number and frequency of each sex chromosome in the O-bu population
| Year | Total | X | YwObu1 | YwObu2 | Y |
|---|---|---|---|---|---|
| 2003 | 226 | 141 (0.624) | 22 (0.097) | 2 (0.009) | 61 (0.270) |
| 2004 | 262 | 163 (0.622) | 26 (0.099) | 0 (0.000) | 73 (0.279) |
| 2005 | 110 | 61 (0.555) | 19 (0.173) | 0 (0.000) | 30 (0.273) |
| 2006 | 226 | 149 (0.659) | 22 (0.097) | 3 (0.013) | 52 (0.230) |
