Table 3.
Logistic regression model defining the risk of a diagnosis of lymphoma in dogs in the VMDB (1964–2002) as a function of age.
| Age Group | Case (%) | Control (%) | Odds Ratio | 95% C.I. | P-value |
|---|---|---|---|---|---|
| Less than 4 years | 1,791 (12.3) | 606,667 (52.4) | 1 | * | * |
| 4–7 years | 4,626 (31.7) | 222,206 (19.2) | 6.73 | (6.36, 7.11) | <.0001 |
| 7–10 years | 4,385 (30.1) | 173,877 (15.0) | 7.78 | (7.35, 8.24) | <.0001 |
| 10–15 years | 3,553 (24.4) | 142,778 (12.4) | 8.06 | (7.60, 8.55) | <.0001 |
| More than 15 years | 218 (1.5) | 11,814 (1.0) | 6.96 | (6.03, 8.03) | <.0001 |
*Baseline exposure; therefore coefficient and P values are not provided and OR is defined as 1.