2016 ACVIM Forum Research Abstract Program

Four-hundred eighteen of nine-hundred eighty two horses with complete epidemiological information were included in the final data analysis. Of the 418 horses, 221 (52.8%) were HI + . Further, horses were stratified into 1 of 3 groups based on ACTH and insulin laboratory results (PPID + /HI + ), (PPID -/HI + ), and (PPID -/HI -). Of the 418 horses, 115 (27.5%) were PPID + /HI + , 106 (25.3%) were PPID -/HI + , and 197 (47.1%) were (PPID -/HI -). Of the 418 horses evaluated, 9.6% of horses <15 years of age were PPID + HI + , 23.5% of horses 15 to 19.9 years of age were PPID + HI + , 27.8% of horses 20 to 24.9 years of age were PPID + HI + , and 39.1% of horses >25 years of age were PPID + HI + . Further, 47.3% of horses <15 years of age were HI + , 61.2% of horses 15 to 19.9 years of age were HI + , 46.7% of horses 20 to 24.9 years of age were HI + , and 44.8% of horses >25 years of age were HI + . One-hundred ninety seven of 418 horses were PPID -HI -.