Table 4.

Final multivariate mixed-effects model for abdominal pain severity with age as predictor and significant covariates simultaneously entered (n = 131; observations = 4890)

	Beta Coefficient a	Standard Error/Standard Deviation	P-value
Fixed effects
β1 Intercept	0.16	0.02	< 0.001
β2 Age (−47.6) years	−0.01	0.003	0.001
β3 Urinary Estrone (Log10)	−0.04	0.02	0.040
β4 Anxiety	0.05	0.01	< 0.001
Random effects
b1 Intercept σ1		0.26
b2 Age (−47.6) years σ2		0.02
b3 Residual σ3		0.35

^a The beta coefficient is a measure of the change in abdominal pain severity for every one unit of change in each respective predictor variable