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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

From: Increasing incidence of Dirofilaria immitis in dogs in USA with focus on the southeast region 2013–2016

State/Region Relative change in incidence % [χ2 (P-value)]
2014 vs 2013 2015 vs 2013 2016 vs 2013
United States 5.83%
[136.86 (< 0.0001)]
10.68%
[470.88 (< 0.0001)]
15.28%
[961.93 (< 0.0001)]
Alabama 11.78%
[17.65 (< 0.0001)]
16.89%
[37.22 (< 0.0001)]
32.39%
[130.54 (< 0.0001)]
Arkansas 12.59%
[10.37 (0.0013)]
29.16%
[55.71 (< 0.0001)]
24.92%
[42.80 (< 0.0001)]
Florida -2.57%
[2.79 (0.0946)]
-1.26%
[0.70 (0.4027)]
-5.28%
[13.66 (0.0002)]
Georgia 11.08%
[34.38 (< 0.0001)]
14.28%
[58.39 (< 0.0001)]
11.71%
[39.99 (< 0.0001)]
Louisiana 3.28%
[2.45 (0.1176)]
10.52%
[25.79 (< 0.0001)]
13.27%
[41.38 (< 0.0001)]
Mississippi -8.37%
[5.77 (0.0163)]
-3.19%
[0.90 (0.3425)]
-9.99%
[11.03 (0.0009)]
Missouri 18.73%
[23.53 (< 0.0001)]
35.19%
[80.16 (< 0.0001)]
53.51%
[173.63 (< 0.0001)]
North Carolina 0.58%
[0.12 (0.7287)]
4.30%
[6.84 (0.0089)]
5.36%
[10.73 (0.0011)]
Oklahoma 6.43%
[1.80 (0.1796)]
4.27%
[0.85 (0.3553)]
20.58%
[18.53 (< 0.0001)]
South Carolina 11.19%
[19.50 (< 0.0001)]
9.97%
[16.47 (< 0.0001)]
13.63%
[30.89 (< 0.0001)]
Tennessee 10.46%
[18.99 (< 0.0001)]
28.05%
[130.90 (< 0.0001)]
26.00%
[114.97 (< 0.0001)]
Texas 2.77%
[6.12 (0.0134)]
9.03%
[65.22 (< 0.0001)]
17.23%
[232.36 (< 0.0001)]