Below is the index with the user freshness values and the time since the subscription that they relate to.
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0=Unknown

1= 0-1 hours
2= 1-2 hours
3= 2-6 hours
4= 6-12 hours
5= 12 hours - 1 day
6= 1-2 days
7= 2-3 days

8= 2-7 days
9= 7-14 days
10= 14-21 days
11= 21-30 days
12= 30-45 days
13= 45-60 days
14= +60 days