Process Evaluation
diabetes
DIABETES
We followed our previous methodology of process evaluation [Participants allocated to the intervention group (who provided consent to participate in further research) were also consecutively invited to participate in a focus group discussion. The number of focus groups was determined by thematic saturation, with a target of 6 to 10 participants per focus group. The in-person focus group discussions (1.5-hour duration) were conducted according to usual processes, were facilitated by an experienced researcher (RH), and were audio recorded and transcribed. Focus groups were facilitated according to a discussion guide that explored key topics, including participant perceptions of the texting program and its utility along with barriers to and enablers of its implementation (Table S2 in The study planned to recruit 1000 participants as sample size calculations estimated that this number would enable detection of a 3.5 mm Hg difference in SBP with 80% power and 20% loss to follow-up (type-1 error of 5% and 2-sided α assuming an SD of 17 mm Hg). A sample size of 625 patients with diabetes allowing for 20% dropout had 80% power to detect a difference of 0.3% in HbA