[True Retention by Card Maturity] Question

[rshah-22]

Does the true retention of young cards include cards still in the learning phase or just young cards that are already considered learned?

[androidpcguy]

Young cards are cards that have graduated and have intervals <21 days. Retention is only calculated on review cards

[i-zanis]

Hello sir,

What is the most important stat. True Retention on the Mature cards or the last True retention stats that mixes both mature and young?