| Parameter | All | CHD versus no CHD | Bilateral versus unilateral CHD | Right versus left unilateral CHD | Dogs without CHD | Dogs with CHD | % CHD | % without CHD | value | Bilateral CHD | Unilateral CHD | % bilateral | % unilateral | value | Left CHD | Right CHD | % left | % right | value |
| | | | | | | | | | | | | | | | | | All dogs | 914,274 | 771,978 | 142,296 | 15.56 | 84.44 | — | 95,376 | 46,918 | 67.03 | 32.97 | — | 21,657 | 18,140 | 54.42 | 45.58 | — | Sex | | | | | | | | | | | | | | | | | Female | 582,990 | 490,884 | 92,106 | 15.80 | 84.20 | <10−6 | 17,079 | 50,189 | 65.97 | 34.03 | <10−6 | 8,039 | 6,444 | 55.51 | 44.49 | 0.001 | Male | 331,281 | 281,091 | 50,190 | 15.15 | 84.85 | 29,839 | 92,105 | 67.60 | 32.40 | 13,618 | 11,696 | 53.80 | 46.20 | AKC group | | | | | | | | | | | | | | | | | Herding | 181,497 | 153,857 | 27,640 | 15.23 | 84.77 | <10−6 | 9,770 | 27,639 | 64.65 | 35.35 | <10−6 | 4,346 | 3,922 | 52.56 | 47.44 | <10−6 | Hound | 24,017 | 21,490 | 2,527 | 10.52 | 89.48 | 782 | 2,527 | 69.05 | 30.95 | 359 | 307 | 53.90 | 46.10 | Working | 217,397 | 178,178 | 39,219 | 18.04 | 81.96 | 12,215 | 39,219 | 68.85 | 31.15 | 5,076 | 4,898 | 50.89 | 49.11 | Sporting | 404,008 | 343,284 | 60,724 | 15.03 | 84.97 | 20,628 | 60,723 | 66.03 | 33.97 | 10,006 | 7,694 | 56.53 | 43.47 | Nonsporting | 51,153 | 44,226 | 6,927 | 13.54 | 86.46 | 2,005 | 6,927 | 71.06 | 28.94 | 1,031 | 238 | 81.25 | 18.75 | Terrier | 19,234 | 16,812 | 2,422 | 12.59 | 87.41 | 633 | 2,422 | 73.86 | 26.14 | 341 | 238 | 58.89 | 41.11 | Toy | 11,005 | 9,197 | 1,808 | 16.43 | 83.57 | 497 | 1,808 | 72.51 | 27.49 | 277 | 194 | 58.81 | 41.19 | Native | 36 | 32 | 4 | 11.11 | 88.89 | 2 | 4 | 50.00 | 50.00 | 1 | 1 | 50.00 | 50.00 | Hybrid | 2,514 | 1,973 | 541 | 21.52 | 78.48 | 196 | 541 | 63.77 | 36.23 | 117 | 66 | 63.93 | 36.07 | Miscellaneous | 3,413 | 2,929 | 484 | 14.18 | 85.82 | 190 | 484 | 60.74 | 39.26 | 103 | 77 | 57.22 | 42.78 | FCI group | | | | | | | | | | | | | | | | | Sheep and cattle | 185,969 | 157,713 | 28,256 | 15.19 | 84.81 | <10−6 | 18,250 | 10,005 | 64.59 | 35.41 | <10−6 | 4,465 | 4,004 | 52.72 | 47.28 | <10−6 | Pinscher Schnauzer, molossoid, and Swiss Mtn/cattle dog | 176,144 | 140,164 | 35,980 | 20.43 | 79.57 | 24,919 | 11,061 | 69.26 | 30.74 | 4,571 | 4,462 | 50.60 | 49.40 | Terrier | 14,542 | 12,374 | 2,168 | 14.91 | 85.09 | 1,623 | 545 | 74.86 | 25.14 | 291 | 209 | 58.20 | 41.80 | Dachshund | 70 | 63 | 7 | 10.00 | 90.00 | 7 | 0 | 100.00 | 0.00 | 0 | 0 | — | — | Spitz and primitive | 64,683 | 58,132 | 6,551 | 10.13 | 89.87 | 4,588 | 1,963 | 70.04 | 29.96 | 915 | 740 | 55.29 | 44.71 | Scent hounds | 16,509 | 14,782 | 1,727 | 10.46 | 89.54 | 1,207 | 520 | 69.89 | 30.11 | 238 | 200 | 54.34 | 45.66 | Pointing dogs | 71,170 | 63,403 | 7,767 | 10.91 | 89.09 | 5,045 | 2,721 | 64.96 | 35.04 | 1,293 | 1,073 | 54.65 | 45.35 | Retrievers, flushers, and water dogs | 340,551 | 286,489 | 54,062 | 15.87 | 84.13 | 35,797 | 18,265 | 66.21 | 33.79 | 8,912 | 6,746 | 56.92 | 43.08 | Companion and toy dogs | 37,085 | 32,071 | 5,014 | 13.52 | 86.48 | 3,484 | 1,530 | 69.49 | 30.51 | 815 | 586 | 58.17 | 41.83 | Sighthounds | 5,129 | 4,860 | 269 | 5.24 | 94.76 | 148 | 121 | 55.02 | 44.98 | 48 | 54 | 47.06 | 52.94 | Latitude | | | | | | | | | | | | | | | | | <30°N | 43,929 | 34,779 | 9,150 | 20.83 | 79.17 | <10−6 | 6,428 | 2,721 | 70.26 | 29.74 | <10−6 | 1,172 | 1,074 | 52.18 | 47.82 | 0.0037 | 30–39°N | 404,336 | 343,861 | 60,475 | 14.96 | 85.04 | 40,594 | 19,880 | 67.13 | 32.87 | 9,131 | 7,865 | 53.72 | 46.28 | 40–49°N | 425,790 | 357,670 | 68,120 | 16.00 | 84.00 | 45,283 | 22,837 | 66.48 | 33.52 | 10,650 | 8,619 | 55.27 | 44.73 | 50°N | 37,506 | 33,364 | 4,142 | 11.04 | 88.96 | 2,777 | 1,365 | 67.04 | 32.96 | 655 | 546 | 54.54 | 45.46 | Season of birth | | | | | | | | | | | | | | | | | Autumn | 215,003 | 182,842 | 32,161 | 14.96 | 85.04 | <10−6 | 21,362 | 10,798 | 66.42 | 33.58 | 0.0016 | 5,020 | 4,099 | 55.05 | 44.95 | 0.10 | Winter | 218,849 | 183,276 | 35,573 | 16.25 | 83.75 | 23,695 | 11,878 | 66.61 | 33.39 | 5,582 | 4,555 | 55.07 | 44.93 | Spring | 255,064 | 213,377 | 41,687 | 16.34 | 83.66 | 28,146 | 13,540 | 67.52 | 32.48 | 6,151 | 5,278 | 53.82 | 46.18 | Summer | 225,358 | 192,483 | 32,875 | 14.59 | 85.41 | 22,173 | 10,702 | 67.45 | 32.55 | 4,904 | 4,208 | 53.82 | 46.18 |
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