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Table 4 Motivational interviewing mean scores by rater and inter-rater reliability for global dimensions and behaviour counts

From: Treatment fidelity in the Camden Weight Loss (CAMWEL) intervention assessed from recordings of advisor-participant consultations

Global dimensions Rater 1 Mean (SD) Rater 2 Mean (SD) ICC(2,2) 95% CI Lower 95% CI Upper
Evocation 3.2 (1.0) 3.5 (0.7) 0.34 −0.58 0.73
Collaboration 3.3 (0.9) 3.2 (0.6) 0.37 −0.52 0.74
Autonomy/Support 3.1 (0.7) 3.4 (0.6) Scale not reliablea   
Direction 4.2 (1.2) 3.8 (1.1) 0.83 0.59 0.93
Empathy 3.6 (0.7) 3.6 (0.6) 0.53 −0.14 0.80
Spirit of Motivational Interviewing 3.2 (0.8) 3.3 (0.5) 0.33 −0.62 0.72
Behaviour counts
 Giving Information 12.3 (5.5) 9.1 (4.1) 0.86 0.67 0.94
 Closed Questions 3.0 (3.0) 2.3 (2.6) 0.65 0.16 0.85
 Open Questions 2.0 (1.7) 2.4 (1.4) 0.53 −0.13 0.81
 Simple Reflections 5.1 (3.9) 5.4 (4.4) 0.83 0.59 0.93
 Complex Reflections 0.9 (1.2) 0.4 (1.0) 0.63 0.11 0.85
 Motivational Interviewing Adherent 6.5 (4.3) 7.8 (5.1) 0.81 0.53 0.92
 Motivational Interviewing Non-adherent 8.2 (6.9) 4.8 (3.5) 0.37 −0.52 0.74
  1. aLanders [39]