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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2013 May 16;132(3):681–687. doi: 10.1016/j.drugalcdep.2013.04.022

Table 3.

Mixed-effects models on advanced MI strategy competence

N. Den.
Source df df F p
Basic Intercept 1 86.57 9329.34 .00
Condition 3 184.37 6.81 .00
Time 2 85.88 8.44 .00
Condition × Time 6 186.70 1.89 .09
Enhanced Intercept 1 84.99 10011.31 .00
Condition 3 186.34 7.90 .00
Time 2 88.59 11.56 .00
Condition × Time 6 187.89 1.91 .08
Interest 1 259.40 1.48 .23
Confidence 1 253.84 15.51 .00
Commitment 1 299.15 4.15 .04
Basic −2 Log likelihood 688.23
Enhanced −2 Log likelihood 671.76
χ2 comparison with df = 3 16.47 .00

Note. Time entered as repeated measures factor with covariance structure (AR1). N. = numerator. Den. = denominator. Condition = self-study, expert-led training, train-the-trainer. Parameters estimated for basic model = 15. Parameters estimated for enhanced model = 18.