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Table 3 Diagnostic accuracy of blood sucrose for diagnosis of EGUS using traditional and Bayesian latent class analyses in 45 foals evaluated pre and post weaning

From: Diagnostic accuracy of blood sucrose as a screening test for equine gastric ulcer syndrome (EGUS) in weanling foals

Lesion type

Test

Parameter

Gold standarda

Bayesian LCb

Estimate % (95% CI)

Estimate % (95% PI)

GL

Sucrose 45

Sensitivity

89 (78, 95)

89 (77, 97)

Specificity

65 (47, 79)

83 (65, 95)

Sucrose 90

Sensitivity

84 (72, 92)

81 (69, 91)

Specificity

71 (53, 84)

95 (80, 100)

Endoscopy

Sensitivity

NA

81 (70, 90)

Specificity

NA

99 (95, 100)

GDL

Sucrose 45

Sensitivity

95 (79, 99)

97 (90, 100)

Specificity

47 (34, 60)

87 (69, 98)

Sucrose 90

Sensitivity

90 (73, 97)

91 (80, 99)

Specificity

55 (42, 67)

97 (83, 100)

Endoscopy

Sensitivity

NA

47 (36, 59)

Specificity

NA

99 (95, 100)

SQL

Sucrose 45

Sensitivity

89 (77, 96)

90 (78, 98)

Specificity

55 (39, 70)

77 (55, 91)

Sucrose 90

Sensitivity

87 (74, 94)

84 (72, 94)

Specificity

64 (48, 78)

94 (76, 100)

Endoscopy

Sensitivity

NA

75 (62, 87)

Specificity

NA

99 (94, 100)

CSL

Sucrose 45

Sensitivity

94 (80, 98)

95 (88, 99)

Specificity

52 (38, 66)

89 (71, 99)

Sucrose 90

Sensitivity

90 (75, 96)

89 (79, 97)

Specificity

58 (44, 71)

98 (85, 100)

Endoscopy

Sensitivity

NA

60 (48, 71)

Specificity

NA

99 (96, 100)

  1. CI confidence interval, PI probability interval; Bayesian analog of the confidence interval. NA not able to calculate since endoscopy is considered the gold standard reference test
  2. GL gastric lesion, GDL glandular lesion, SQL squamous lesion, CSL clinically significant lesion
  3. aCalculated relative to direct observation of lesions via endoscopy as the gold standard
  4. bBased on Bayesian latent class analysis with sucrose tests evaluated at the 24 µmol/L cutoff and endoscopy assumed to be an imperfect test