Table 4.
Patterns of excess lymphoma by breed and age, comparing the observed numbers of lymphoma cases per breed, over four (quartile) age ranges, with expected numbers computed from age incidence.
| Age ≤ 3 | 4 ≤ Age ≤ 6 | 7 ≤ Age ≤ 9 | 10 ≤ Age ≤ 14 | No dogs by breed | |||||
|---|---|---|---|---|---|---|---|---|---|
| O | E | O | E | O | E | O | E | ||
| Border collie | 1 | 0.37 | 0 | 0.47 | 1 | 0.68 | 1 | 0.93 | 2378 |
| Boxer | 1 | 1.06 | 2 | 1.05 | 4* | 0.75 | 3¶ | 0.52 | 5628 |
| Bulldog | 3* | 0.38 | 0 | 0.24 | 0 | 0.10 | 0 | 0.006 | 1720 |
| Bullmastiff | 0 | 0.21 | 3§ | 0.17 | 0 | 0.09 | 0 | 0.016 | 1075 |
| CKCS | 0 | 0.71 | 1 | 1.15 | 2 | 1.08 | 0 | 0.85 | 4529 |
| Cocker spaniel | 0 | 0.95 | 1 | 1.16 | 1 | 1.06 | 0 | 0.90 | 5568 |
| Crossbred | 2 | 1.01 | 1 | 2.06 | 4 | 4.03 | 4 | 5.13 | 8855 |
| Dalmatian | 1 | 0.37 | 0 | 0.34 | 0 | 0.20 | 0 | 0.20 | 1973 |
| Doberman | 1 | 0.34 | 0 | 0.30 | 0 | 0.43 | 1 | 0.54 | 2006 |
| English springer spaniel | 0 | 0.72 | 0 | 0.87 | 1 | 0.89 | 3 | 0.93 | 4308 |
| German shepherd dog | 0 | 2.14 | 1 | 2.36 | 1 | 2.33 | 1 | 1.82 | 12157 |
| Golden retriever | 5¶ | 1.02 | 3 | 2.78 | 1 | 2.40 | 6 | 2.86 | 11348 |
| Irish setter | 0 | 0.16 | 1¶ | 0.31 | 0 | 0.22 | 0 | 0.26 | 1123 |
| Labrador retriever | 2 | 2.84 | 2 | 3.20 | 2 | 2.89 | 1 | 3.02 | 16259 |
| Miniature schnauzer | 0 | 0.17 | 0 | 0.20 | 1 | 0.18 | 0 | 0.16 | 1007 |
| Old English sheepdog | 0 | 0.18 | 1 | 0.29 | 1 | 0.27 | 0 | 0.26 | 1086 |
| Rottweiler | 0 | 0.45 | 0 | 0.32 | 2 | 0.44 | 0 | 0.38 | 2446 |
| Staffordshire bull terrier | 0 | 0.51 | 0 | 0.39 | 1 | 0.47 | 1 | 0.38 | 2844 |
| West Highland white terrier | 0 | 1.07 | 0 | 1.15 | 0 | 0.99 | 1 | 0.81 | 6134 |
| Other breeds | 6 | 6.5 | 11 | 8.22 | 5 | 7.48 | 5 | 7.05 | 38240 |
|
| |||||||||
| Total | 130684 | ||||||||
O: observed, E: expected.
*Individually P ≤ 0.01 by Poisson distribution.
§Individually P ≤ 0.001 by Poisson distribution.
¶Individually P ≤ 0.05 by Poisson distribution.
Table from [158].