Your evidence is still an anecdote, it just involves a couple more people. Still potentially involves some amount of confirmation bias.

It stops being anecdotal when it moves away from your personal experience (including the anecdotal experience of your friends) and moves towards an actual scientific study.

For Reference:

> Anecdotal evidence is evidence from anecdotes, i.e., evidence collected in a casual or informal manner and relying heavily or entirely on personal testimony.