Incorporating nonlinearity into mediation analyses

Table 2 Bias-corrected bootstrapped \( 95\% \) confidence intervals for the monotonic mediation model for child adaptation as a function of family functioning as mediated by difficulty controlling for having Crohn’s disease or a bowel disorder with independent omitted factors or errors

Family functioning x	Lower bound \( L(x) \) on natural indirect effect^a	Upper bound \( U(x) \) on natural indirect effect^a	Normalized width \( W \) of the confidence interval^b
1	2.28	8.19	0.72
2	9.14	32.76	0.72
3	20.56	73.72	0.72
4	36.55	130.05	0.72

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