* Unadjusted group means with standard errors (displayed as error bars) comparing pain severity and pain interference across four clinically defined groups using analysis of variance (ANOVA) tests; main effect of group status (pain only, pain and anxiety, pain and depression, and pain, depression, and anxiety). For pain severity and interference, the overall F test value is significant (P < 0.001) for increasing severity and interference when pain is comorbid with depression and/or anxiety.
1Score range: 0 (none) to 10 (most severe) as assessed by Brief Pain Inventory
2Score range: 0 (no interference) to 10 (completely interferes) as assessed by Brief Pain Inventory