Table 2

Test-retest Reliability (Reproducibility): Score Stability of the GSRS and GIQLI

N
 Mean
Test 1
 Mean
Test 2
 Difference
 Wilcoxon Rank-Sum
test
 Kendall's Tau
correlation
 ICC












Signed
rank
 p-value

GSRS







     Abdominal Pain
 20
 1.88
 1.73
 -0.15
 -11.50
 0.39
 0.64a
 0.80
     Reflux Syndrome
 20
 1.48
 1.13
 -0.35
 -7.50
 0.06
 0.67b
 0.57
     Diarrhea
 20
 1.37
 1.63
 0.27
 12.00
 0.25
 0.49b
 0.16
     Indigestion Syndrome
 20
 1.76
 1.71
 -0.05
 -2.00
 0.89
 0.72a
 0.93
     Constipation
 20
 1.57
 1.50
 -0.07
 -9.00
 0.19
 0.73a
 0.98
GIQLI







     Total Score
 19
 121.64
 124.45
 2.81
 7.00
 0.68
 0.60a
 0.87
     Symptoms
 20
 3.47
 3.53
 0.06
 45.50
 0.02
 0.67a
 0.78
     Emotion
 20
 3.04
 3.31
 0.27
 11.50
 0.57
 0.74a
 0.81
     Physical Function
 20
 3.08
 3.15
 0.07
 6.50
 0.64
 0.53b
 0.90
     Social Function
 20
 3.40
 3.48
 0.08
 -0.50
 1.00
 0.81a
 0.82
     Medical Treatment
 19
 3.63
 3.58
 -0.05
 28.50
 0.23
 0.60a
 0.72

a p < 0.001

b p < 0.05

Machnicki et al. Health and Quality of Life Outcomes 2008 6:53   doi:10.1186/1477-7525-6-53