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. 2016 Dec 19;19(10):1103–1109. doi: 10.1177/1098612X16684408

Table 1.

Univariate analysis of risk factors for hyperthyroidism (total thyroxine [tT4] >50 nmol/l or tT4 between 30 and 50 nmol/l with thyroid-stimulating hormone <0.03 ng/ml and free T4 >50 pmol/l)

Hyperthyroid cats
Variable Category N n % P value*
Age (years) 9–11 121 3 3 0.03
12–14 93 10 11
>14 88 8 9
Sex Female 161 13 8 0.50
Male 141 8 6
Breed DSH 201 13 7 0.62
DLH 29 4 14
Siamese/Siamese crosses 26 1 4
Persian/Persian crosses 10 0 0
Burmese 10 0 0
Balinese 6 1 17
Other breeds 20 2 10
Purebred 61 3 5 0.57
Non-purebred 241 18 8
Siamese/Siamese crosses 26 1 4 1.00
Other breeds 276 21 8
Number of cats in household 1 94 8 9 0.78
2 104 7 7
>2 104 6 6
Vaccinated Yes 270 20 7 0.72
No 18 0 0
Not sure 14 1 7
Dewormed Yes 274 20 7 0.44
No 18 0 0
Not sure 10 1 10
Flea control Yes 139 8 6 0.54
No 162 13 8
Not sure 1 0 0
Exclusively indoors Yes 246 18 7 0.78
No 56 3 5
Canned food in diet Yes 71 8 11 0.11
No 231 13 6
Hunter Yes 120 8 7 1
No 182 13 7
Water Tap (unboiled) 256 18 7 0.34
Tap (boiled) 32 1 3
Mineral 14 2 14
*

P value for two-tailed Fisher’s exact test

DSH = domestic shorthair; DLH = domestic longhair