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The group by timeline charts for three subscales of postpartum bonding questionnaire (PBQ). A, The impaired bonding subscale (IB). B, The rejection and pathological anger subscale (RPA). C, The infant-focused anxiety subscale (IFA). Abbreviations: BT, buprenorphine treatment for opioid use disorder; CG, comparison group. T1, 1 month postpartum; T2, 4 months postpartum
