Design and Procedure
The present study employed a 2 (Condition: intervention vs. control) by 2 (Time: preintervention vs. 8-week post-intervention) mixed measure design, with Time a repeated measure factor. A power calculation was undertaken using G*power 3.1 software (Faul et al., 2009), whereby a repeated measure MANOVA is used with a power of 80%, an effect size of 0.4 and α=0.05, yielding a minimum sample size required of 97 participants (that was minimally exceeded following exclusions, etc.). A total of 220 adults diagnosed with T2D were selected from a list provided by IDS using permuted block randomization (a 1:1 allocation ratio) and contacted. As a result, the exclusion could only take place after the randomization process. Permuted block pattern was obtained via an Internet-generated pattern with a block size of 8. The participant’s list was provided by IDS staff, and the researchers were blinded. Figure 1 shows the flow of participants in the study. Written informed consent was obtained from each participant before the experiment. The study conforms to CONSORT guidelines (Schulz et al., 2010) (see Supplementary File 1).