A 6-free-months vs A 6-free-month

Question

A complete search of the internet has found these results:

A 6-free-months is the most popular phrase on the web.

Some examples from the web:

in the case the country has not been free for 6 months of vesicular stomatitis, they were transported to the place of loading protected from vector insects;
The 6-month event-free survival for the ITT population was 44% with a median event-free survival of 4.6 months, which was similar to the results for the progression-free survival.

Some examples from the web:

in the case the country has not been free for 6 months of vesicular stomatitis, they were transported to the place of loading protected from vector insects;
The 6-month event-free survival for the ITT population was 44% with a median event-free survival of 4.6 months, which was similar to the results for the progression-free survival.

Answer 1

More popular!

A 6-free-months

2 results on the web

Answer 2

1 results on the web