The prevalence of diabetes in Lagos, Nigeria is on the rise, highlighting the need for effective monitoring tools to manage this condition. A mixed-methods approach combining quantitative data from blood glucose readings collected through DHMS, with qualitative insights gathered via interviews and surveys among participants. Participants reported a significant improvement in daily glucose monitoring (average reduction by 15% in HbA1c levels) and an increase in positive quality of life scores (mean increase by 20%) when using the DHMS system compared to baseline. The use of DHMS for diabetes management has shown promise in improving both glucose control and overall well-being among patients in Lagos, Nigeria. Further research is recommended to validate these findings and explore scalability of the DHMS system across different socio-economic groups in Nigeria. Diabetes Management, Digital Health Monitoring Systems, Quality of Life, Blood Glucose Control Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.