Within a Randomized Trial
Intervention studies may carry out quantitative and qualitative interviews in parallel throughout the follow-up interval for intervention and control groups. Cramer and colleagues (2011) tested the feasibility and acceptability of group cognitive behavioral therapy (CBT) for women with depression, using both quantitative and qualitative methods over time. The Patient Health Questionaire-9 measured depressive symptoms, while qualitative interviews with all participants, clinicians, and community staff sought to understand the acceptability and feasibility of the intervention. The authors provided both quantitative and qualitative interpretation of their findings. Quantitative findings demonstrated the effectiveness of group-based CBT for women with depression. Qualitative findings described that the intervention was well-received by participants and the intervention acted as a catalyst for changing negative thoughts and bringing positive change in taking up new jobs, volunteer work, and other activities salient to the participants. High engagement in treatment was largely due, according to the participants, to support and encouragement provided by facilitators. Qualitative approaches provided insight into the experiences of participants in the intervention trial, expanding on factors that were most salient to participants beyond what quantitative data collection methods revealed.