The datasets are linked to the manuscript titled; ‘The effectiveness of psychologically-informed physiotherapy for people with neck pain and the mediating role of illness perceptions: A replicated single-case experimental design study'. This replicated single-case study was conducted to explore the effectiveness of a personalised intervention addressing unhelpful illness perceptions and dysfunctional movement behaviour in people with non-specific neck pain, and to explore the mediating role of changes in illness perceptions. More specifically, this study aimed to explore: (1) whether global perceived effect, function, pain and self-efficacy improved during and after psychologically-informed physiotherapy, (2) whether changes in illness perceptions mediate the effect of the intervention and (3) whether specific personal or neck pain related factors moderate the effect of the intervention. The first dataset contains clinical data of repeated measurements of several quantitative outcome variables in a sample of 14 patients with non-specific neck pain and a risk profile for chronicity (Start Neck Tool score≥4). Measurements included: (a) Demographic and neck pain related data (i.e., gender, age, height, bodyweight, education level, work status, duration and onset of their neck pain (gradual or sudden, and if sudden, history of trauma), disability (using the Neck Disability Index) and risk profile (using the StartNeckTool). These data were used to select and describe the study sample. (b) Primary and secondary outcome measurements (i.e., respectively Global Perceived Effect (using the Global Perceived Effect Scale), Function (using the Patient Specific Functioning Scale for two self-selected activities; PSFS-1 and PSFS-2), Pain Intensity (using the Numeric Pain Rating Scale (NPRS) and Self-efficacy (using the Pain Self Efficacy Questionnaire-4 item version (PSEQ-4)) and (c) Data regarding the proposed mediating factors (i.e., Illness Perceptions, evaluated with the Brief Illness Perception Questionnaire (B-IPQ) and the Fear Avoidance Beliefs Questionnaire-physical activity subscale). These measurements were conducted during (A) a pre-intervention baseline phase of two weeks, (B) an intervention-phase of 4-7 physiotherapy sessions offered once a week and (A’) an intervention-withdrawal phase. Outcomes were self-reported and measured twice a week from enrolment till the end of the intervention, with two follow-up measurements, at one week and at three months after the last treatment session. Thirteen physiotherapists from 12 primary care physiotherapy clinics in the Netherlands participated in the study. The 14 participants who were included in the study were treated by seven therapists. The characteristics of the participating therapists are specified in a second dataset. This dataset contains information regarding gender, age, work experience, professional master degrees and/or relevant courses of the participating therapists.

SPSS, 27.0