According to large-scale patient behavior analysis, which factor has been shown to have the strongest correlation with medication adherence in chronic disease management?

The healthcare industry increasingly relies on big data analytics to understand patient behaviors and improve outcomes. From medication adherence to preventive care participation, healthcare providers analyze patterns to develop more effective treatment strategies and engagement approaches. This trivia question tests your knowledge about an important finding from patient behavior analysis that has influenced modern medical practice.

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Complexity of medication regimen (number of pills and dosing frequency)
Patient's educational level
Distance between patient's home and healthcare facility
Cost of medication (even when accounting for insurance coverage)