Samples | Mottling + tip burn two-year-old | Mottling + tip burn one year old | No symptoms |
1985 + 1986, n = 60(57) | n = 25/57 | n = 19/57 | n = 13/57 |
| 43.1% | 33.3% | 22.8% |
2006, n = 26 | n = 12/26 | n = 11/26 | n = 3/26 |
| 46.2% | 42.3% | 11.5% |