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Table 1 Distribution of characteristics (numbers) of Shetland pony mares and Icelandic horses for cases and controls

From: Genome-wide association study of insect bite hypersensitivity in two horse populations in the Netherlands

  Shetland pony mares Icelandic horses
Trait Cases Controls Total Cases Controls Total
Number of animals 103 97 200 73 73 146
Year of scoring       
2009 83 78 161 - - -
2010 20 19 39 73 73 146
Month of scoring       
September 52 52 104 22 29 51
October 47 42 89 51 44 95
November 4 3 7 - - -
Veterinarian       
1 97 93 190 73 73 146
2 6 4 10 - - -
Pedigree       
Number of sires 84 86 129 57 61 95
Number of dams 100 93 187 68 67 126
Age, years       
Mean (SD) 7.1 (4.5) 8.3 (4.4) 7.7 (4.5) 13.1 (6.0) 12.6 (5.9) 12.8 (5.9)
Range 0 – 23 4 – 22 0 – 23 4 – 29 4 – 35 4 – 35
Sex       
Female 103 97 200 51 43 94
Male - - - 22 30 52
Withers height category       N/Aa
Mini 28 24 52    
Small 17 18 35    
Middle 32 27 59    
Tall 26 28 54    
Imported from Iceland    N/Aa    
Yes     17 2 19
No     56 71 127
Coat colour       
Bay 5 4 8 11 7 18
Black 51 52 103 16 11 27
Black paint 6 4 10 2 3 5
Chestnut 26 23 49 8 14 22
Chestnut paint 8 6 14 - 2 2
Other 7 8 15 28 35 63
Silver dapple - - - 8 1 9
  1. aN/A = not applicable.