Figure 3

ROC curves for adolescents' scores in Relations with Friends, Relations with Parents and Global score in the Spanish VSP-A versus poor social support (measured by the Oslo Social Support scale). AUC: Area Under Curve; 95% CI: 95% Confidence Interval; SE: Sensitivity; SP: Specificity. [Black line] Relation with parents. AUC: 0.77 (95% CI: 0.72–0.82). Optimal cut-off-point: 60.4 SE: 0.76 SP: 0.64. [Dotted line] Relation with friends. AUC: 0.77 (95% CI: 0.72–0.82). Optimal cut-off-point: 67.5 SE: 0.78 SP: 0.59. [Dashed line] Global HRQL score. AUC: 0.77 (95% CI: 0.71–0.82). Optimal cut-off-point: 64.8 SE: 0.72 SP: 0.72