Table I.
Reported prevalence of equine pituitary pars intermedia dysfunction.
| Case Definition | Population (study duration) | N | Age (years) | Location | Prevalence (%) | Reference |
|---|---|---|---|---|---|---|
| Not stated | Practice | 4000 | All ages | USA | 0.075 to 0.15 Estimated | (5) |
| Hirsutism and endogenous ACTH | Hospital (1 year) | 1800 | All ages | Netherlands | 0.5 | (6) |
| Not stated | Owner questionnaire | 1230 | All ages | UK | < 1 | (7) |
| Clinical examination and DST | Hospital (4 months) | 23 | 26.5 (median) | UK | 39 | (8) |
| Hirsutism or endogenous ACTH or necropsy | Hospital (10 years) | 467 | All horses | USA | 0.36 | (9) |
| > 20 | 10 | |||||
| > 30 | 19 | |||||
| Veterinarian diagnosed | Owner questionnaire | 218 | > 20 | USA | 8 | (10) |
| Shedding/moulting changes “Cushing’s syndrome” | Owner questionnaire | 918 | > 15 | UK | 12.5 | (11) |
| 3.3 | ||||||
| Hirsutism | Hospital | 134 | All ages | USA | 0.16 | (12) |
| DST | 11 years | 632 | ||||
| DST/TRH stimulation | 1993 | 0.025 | ||||
| 2002 | 0.37 | |||||
| Not stated | Owner questionnaire | 797 | All ages | UK | 2.8 | (13) |
| Hair coat changes | Owner questionnaire | 339 | > 15 | Australia | 14 | (14) |
| Endogenous ACTH test | Horses from above study | 325 | > 15 | Australia | 21.2 | (14) |
| Not stated | Multi-hospital records 26 years | 70 477 | All ages | UK | 2.9 | (15) |