Table 2 Outcome of horses with colonic sand accumulations and treated with feeding (Group 1), nasogastric tubing once and feeding (Group 2), or daily nasogastric tubing (Group 3) of psyllium and/or MgSO₄

Number of horses in Clinic A

11

2

164

Number of horses in Clinic B

46

17

6

Total number of horses

57

19

170

Sand before treatment, median (cm²)

227

456

285

95 % confidence interval for median (minimum–maximum)

176–332 (75–1205)

242–631 (76–1241)

226–314 (79–1021)

Sand after treatment, median (cm²)

103*

106^†

6

95 % confidence interval for median (minimum–maximum)

64–152 (0–810)

32–385 (0–792)

0–38 (0–828)

Number of resolved horses (sand after treatment <25 cm²)

14/57*

4/19^†

91/170