Many health care consumers still don’t know how to evaluate the array of plan choices offered to them during the annual fall enrollment period. This may be particularly true of those evaluating plans for prescription drug costs.

The online health plan evaluation firm eHealth reviewed plan selection choices from 22,000 people during last year’s Medicare plan enrollment period. Because these health plan members used eHealth’s online tools to aid in their plan selection, eHealth was able to track and analyze their choices as they navigated through the selection process.

The big takeaway from the analysis: users were not selecting the prescription drug plans that would save them the most money.