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. 2013 Apr 15;6:100. doi: 10.1186/1756-3305-6-100

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.