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Table 3 Effect sizes of the dependent variables in the CBT and OBT groups in comparison with the AP group at pre-treatment (T1), post-treatment (T2), and 6 months (T3) and 12 months (T4) after treatment

From: Psychological pain treatment in fibromyalgia syndrome: efficacy of operant behavioural and cognitive behavioural treatments

Group
  CBT – AP OBT – AP
Variable ES T1–T2 ES T1–T3 ES T1–T4 ES T1–T4a ES T1–T2 ES T1–T3 ES T1–T4 ES T1–T4a
FIQ – Physical impairment 0.18 0.83 0.84 0.71 0.21 0.37 1.15 1.07
MPI – Pain 0.29 0.40 1.14 0.31 0.33 0.30 1.10 0.62
MPI – Affective distress 0.76 1.39 1.57 0.61 0.22 0.59 0.86 0.72
PRSS – Coping 1.16 1.72 2.66 1.70 0.21 0.73 1.23 0.38
PRSS – Catastrophising 0.62 0.96 1.44 0.54 0.12 0.89 0.97 0.41
Pain behaviour 0.44 0.42 0.57 0.49 0.59 0.72 1.89 1.48
MPI – Solicitous spouse behaviour 0.19 0.41 0.44 0.37 0.43 1.00 1.71 0.57
  1. aAdjusted ES based on the AP group with the dropout values from baseline carried forward to the 12-month follow-up. Medium (>0.5) and large (>0.8) ESs were bolded. AP, attention-placebo; CBT, cognitive behaviour therapy; ES, effect size; FIQ, Fibromyalgia Impact Questionnaire, MPI, Multidimensional Pain Inventory; OBT, operant behavior therapy; PRSS, Pain Related Self-Statements Scale.