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. Author manuscript; available in PMC: 2021 May 13.
Published in final edited form as: J Pediatr Psychol. 1999 Jun;24(3):271–280. doi: 10.1093/jpepsy/24.3.271

Figure 1.

Figure 1

Estimated regression lines showing predicted Functional Disability Inventory (FDI) scores for subjects with low (−1 SD) and high (+1 SD) levels of academic competence on the Self-Perception Profile for Adolescents (SPPA). Graphed lines were plotted by selecting values one standard deviation above and below the mean for academic competence and IBS symptoms; these values were multiplied by their unstandardized regression coefficients to obtain values for plotting the predicted regression lines.