Table 2 Relative change in incidence of positive heartworm antigen test results in 2014–2016 compared to 2013 and test statistics for the change in incidence

5.83%

[136.86 (< 0.0001)]

10.68%

[470.88 (< 0.0001)]

15.28%

[961.93 (< 0.0001)]

11.78%

[17.65 (< 0.0001)]

16.89%

[37.22 (< 0.0001)]

32.39%

[130.54 (< 0.0001)]

12.59%

[10.37 (0.0013)]

29.16%

[55.71 (< 0.0001)]

24.92%

[42.80 (< 0.0001)]

-2.57%

[2.79 (0.0946)]

-1.26%

[0.70 (0.4027)]

-5.28%

[13.66 (0.0002)]

11.08%

[34.38 (< 0.0001)]

14.28%

[58.39 (< 0.0001)]

11.71%

[39.99 (< 0.0001)]

3.28%

[2.45 (0.1176)]

10.52%

[25.79 (< 0.0001)]

13.27%

[41.38 (< 0.0001)]

-8.37%

[5.77 (0.0163)]

-3.19%

[0.90 (0.3425)]

-9.99%

[11.03 (0.0009)]

18.73%

[23.53 (< 0.0001)]

35.19%

[80.16 (< 0.0001)]

53.51%

[173.63 (< 0.0001)]

0.58%

[0.12 (0.7287)]

4.30%

[6.84 (0.0089)]

5.36%

[10.73 (0.0011)]

6.43%

[1.80 (0.1796)]

4.27%

[0.85 (0.3553)]

20.58%

[18.53 (< 0.0001)]

11.19%

[19.50 (< 0.0001)]

9.97%

[16.47 (< 0.0001)]

13.63%

[30.89 (< 0.0001)]

10.46%

[18.99 (< 0.0001)]

28.05%

[130.90 (< 0.0001)]

26.00%

[114.97 (< 0.0001)]

2.77%

[6.12 (0.0134)]

9.03%

[65.22 (< 0.0001)]

17.23%

[232.36 (< 0.0001)]