Table 2.

Inter-rater reliability of MI skill variables and mean ratings by intervention condition

MITI Code	ICC	BNI (N=171)	MOTIV (N=180)	Z, p-value
Global MI Spirit	0.78	3.6 ± 0.69 3.67 (3.33 - 4) 1.56 - 5	4.56 ± 0.46 4.67 (4.33 - 5) 2.67 - 5	−12.60, <0.0001
Global Empathy	0.72	3.71 ± 0.96 4 (3 - 4) 1 - 5	4.69 ± 0.54 5 (4.33 - 5) 2 - 5	−10.77, <.0001
Ratio of Reflections to Questions	0.90	0.75 ± 0.43 0.71 (0.45 - 0.93) 0.11 - 3.5	1.47 ± 0.63 1.36 (1.11 - 1.7) 0.45 - 4.08	−11.97, <.0001
Percent Open Questions	0.79	34% ± 15% 33% (22% - 45%) 4% - 75%	53% ± 13% 53% (44% - 62%) 24% - 88%	−10.59, <.0001
Percent Complex Reflections	0.47	43% ± 20% 42% (28% - 57%) 0% - 90%	49% ± 12% 51% (42% - 57%) 11% - 80%	−3.48, 0.0005
Simple Reflections	0.72
Complex Reflections	0.71
Percent MI Adherent	0.57	70% ± 27% 73% (54% - 96%) 0 - 1	96% ± 14% 100% (100% - 100%) 0% - 100%	−11.52, <.0001

ICC: Intraclass correlation coefficient

MITI = Motivational Interviewing Treatment Integrity

Continuous Tests: Wilcoxon Two-Sample

Continuous Variables: Mean ± SD; Median (IQR); Range