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Interaction plots and 95% confidence intervals for full sample. Models controlled for age and correlated nature of the twin data. Presented for significant interaction only (P ≤ .05). MPQ-Total, Short Form McGill Pain Questionnaire total score; MPQ VAS, MPQ Visual Analogue Scale; MPQ PPI, MPQ Present Pain Intensity; PCL-Total, PTSD checklist total score; PCL-B, PTSD re-experiencing; PCL-C, PTSD avoidance; PCL-D, PTSD arousal.
