Table 3 Percentage of positive canine tests for heartworm antigens ^a within physical category and according to clinical signs

Age (yr)


1-2

80

534

15.0*

6 (7.5)

21 (4.6)

1 (1.3)

1 (0.2)

2 (2.5)

7 (1.5)

3 (3.8)

20 (4.4)

5 (6.3)

22 (4.8)


>2-4

103

379

27.2^†

11 (10.7)

36 (13.0)

0 (0.0)

2 (0.7)

3 (2.9)

7 (2.5)

9 (8.7)

22 (8.0)

8 (7.8)

26 (9.4)


>4-6

80

300

26.7^†

13 (16.3)

23 (10.6)

0 (0.0)

0 (0.0)

6 (7.5)

7 (3.2)

7 (8.8)

23 (10.6)

8 (10.0)

13 (6.0)


>6

91

318

28.6^†

20 (22.0)

48 (21.1)

3 (3.3)

9 (4.0)

4 (4.4)

15 (6.6)

17 (18.7)

48 (21.1)

12 (13.2)

40 (17.6)

Weight (kg)


<5

42

311

13.5*

8 (19.0)

35 (13.0)

0 (0.0)

3 (1.1)

1 (2.4)

9 (3.3)

6 (14.3)

22 (8.2)

9 (21.4)

23 (8.6)


5-15

178

723

24.6^†

24 (13.5)

70 (12.8)

2 (1.1)

7 (1.3)

7 (3.9)

20 (3.7)

16 (9.0)

55 (10.1)

9 (5.1)

39 (7.2)


>15-25

85

310

27.4^†

9 (10.6)

17 (7.6)

0 (0.0)

1 (0.4)

2 (2.4)

4 (1.8)

7 (8.2)

22 (9.8)

8 (9.4)

21 (9.3)


>25

49

187

26.2^†

9 (18.4)

6 (4.3)

2 (4.1)

1 (0.7)

5 (10.2)

3 (2.2)

7 (14.3)

14 (10.1)

7 (14.3)

18 (13.0)

Breed


Mongrel

245

924

26.5^†

31 (12.7)

67 (9.9)

3 (1.2)

8 (1.2)

5 (2.0)

18 (2.7)

19 (7.6)

56 (8.3)

18 (7.3)

54 (8.0)


Mixed

45

330

13.6*

11 (24.4)

23 (8.1)

0 (0.0)

0 (0.0)

3 (6.7)

6 (2.1)

5 (11.1)

22 (7.7)

5 (11.1)

20 (7.0)


Purebred

64

277

23.1^†

8 (12.5)

37 (17.4)

1 (1.6)

4 (1.9)

7 (10.9)

11 (5.2)

12 (18.8)

34 (16.0)

10 (15.6)

27 (12.7)

Sex


Female

196

838

23.4

21 (10.7)

56 (8.7)

1 (0.5)

4 (0.6)

4 (2.0)

18 (2.8)

18 (9.2)

59 (9.2)

15 (7.7)

46 (7.2)


Male

158

693

22.8

29 (18.4)

72 (13.5)

3 (1.9)

8 (1.5)

11 (7.0)

18 (3.4)

18 (11.4)

54 (10.1)

18 (11.4)

55 (10.3)

Data missing

3

9

2

5

4

11

3

7

1

10