Table 2.

Individual Mediation Analyses of Psychological Factors on IBS Abdominal Pain

Independent Variable	Mediator	Path a β (CI)	Path b β (CI)	Path c β (CI)	Path c′ β (CI)	Mediated β (CI)
Anxiety	Somatization	0.38 (0.27 – 0.50)	0.28 (0.15 – 0.41)	0.14 (0.02 – 0.26)	0.03 (−0.09 – 0.16)	0.11 (0.05 – 0.18)
Anxiety	Pain Catastrophizing	0.45 (0.34 – 0.55)	0.25 (0.11 – 0.39)	0.14 (0.02 – 0.26)	0.03 (−0.10 – 0.16)	0.11 (0.05 – 0.18)
Depression	Somatization	0.41 (0.31 – 0.52)	0.18 (0.05 – 0.31)	0.32 (0.21 – 0.43)	0.25 (0.12 – 0.37)	0.08 (0.02 – 0.14)
Depression	Pain Catastrophizing	0.36 (0.26 – 0.47)	0.16 (0.03 – 0.28)	0.32 (0.21 – 0.43)	0.27 (0.14 – 0.39)	0.06 (0.01 – 0.11)

β is the standardized coefficient of the specific interaction as outlined in the paths in Figure 1.

The CI in each path noted are the bootstrapping CIs with 95% confidence. Inclusion of 0 within the CI indicates statistical non-significance.

Model controlled for the covariates of age, gender, and race/ethnicity

CI, confidence interval; IBS, irritable bowel syndrome