Detailed search strategies are described in Appendix 1 on the eAddenda. Citation tracking was performed by manually screening click here reference lists of reviews and relevant papers about constructs of therapeutic alliance. Papers were not excluded on the basis of the language of publication. Two reviewers (RZP and VCO) screened all relevant titles and abstracts and selected 69 potentially relevant papers. Both reviewers independently evaluated the full reports for eligibility. Disagreements were resolved by discussion. Studies were included if they met specific eligibility criteria regarding inhibitors settings, participants, therapeutic alliance constructs, coding procedures, and communication

factors. Study design: To be included, studies had to investigate the association between communication factors (interaction styles, verbal

factors, or non-verbal factors) and constructs of the therapeutic alliance (collaboration, affective bond, agreement, trust, or empathy), measured during encounters between health practitioners and patients. Settings: To be included, studies had to investigate any encounter between patients and clinicians in primary, secondary, or tertiary care settings. Participants: RG7204 research buy Studies investigating interactions between qualified clinicians and real patients were included. Studies including students as practitioners and standardised or virtual patients were excluded. However, studies including a mixed sample of real and standardised patients were eligible if data were presented separately. Interactions in highly specific clinical scenarios such as those with patients with mental illness and deaf or mute patients were excluded

as these interactions have features that may not allow generalisation to wider settings. Communication factors: There was no restriction on the type of communication factors included in this review. These factors were categorised as belonging to one of three groups: interaction style, verbal factors, or non-verbal factors. Interaction style was defined as a communication factor that exhibits aspects of both verbal and non-verbal factors simultaneously. Therefore, interaction style could incorporate features such as affective connection (friendly or personable distance), 3-mercaptopyruvate sulfurtransferase orientation (problem-focused or patient-focused), scope of information (biomedical and psychosocial), openness to patient, sharing of control, and negotiation of options ( Flocke et al 2002). Verbal factors include greetings, facilitation, checking, open-ended, and encouraging questions. Non-verbal factors include posture, facial expression, and body orientation. Therapeutic alliance constructs: To be included studies had to have assessed any construct of therapeutic alliance (for example, collaboration, affective bond, agreement, trust, or empathy). There are several ways to assess communication factors.