To evaluate the effectiveness of different therapeutic interventions on the control of blood glucose concentration, clinical researchers monitored four cohorts of patients with Type 2 diabetes. The blood glucose concentrations of the cohorts, recorded 2 hours post-therapy, were represented in the format mean±standard deviation\text{mean} \pm \text{standard deviation}mean±standard deviation as follows:
Identify which cohort's post-therapy blood glucose concentration measurement is the most precise, and explain your choice.