Table 3.
Relationship between age of dogs and seropositivity
| DAT | Year 1990 | Year 1999 | Year 2010 | |||
|---|---|---|---|---|---|---|
| |
Mean age (± SD) – years |
No. dogs |
Mean age (± SD) – years |
No. dogs |
Mean age (± SD) – years |
No. dogs |
| Seropositive |
7.04 (± 2.71)a |
141 |
6.96 (± 2.98)b |
335 |
6.57 (± 3.37)c |
84 |
| Seronegative |
4.71 (± 2.40)a |
3,473 |
↑5.26 (± 2.76)b |
3,227 |
5.34 (± 2.81)c |
1,411 |
| Total | 4.80 (± 2.46) | 3,614 | ↑5.42 (± 2.82) | 3,562* | 5.41 (± 2.86) | 1,495 |
DAT: direct agglutination test; SD: standard deviation; a, b, c: statistical significant difference between seropositive and seronegative; ↑: statistical significant difference to the previous year; *: age was not determined for one dog.