Supporting Information Item 1: Summary of historical and clinicopathological variables obtained on admission from ponies and horses with gastrointestinal disease presenting to a referral hospital. Data are shown as mean ± s.d., median and range or number of animals (pain score and reflux); n: number of animals for which a measurement was available; HR: heart rate; RR: respiratory rate; temp: rectal temperature; PCV: packed cell volume; WBC: peripheral white blood cell count; TS: total solids concentration; *: P<0.05; †: in one pony with intestinal rupture the site of the lesion was not determined; ††: surgical treatment was recommended but declined for financial reasons in one pony and 2 horses.

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