The examiners have a preplanned examination report they evaluate you based on, in the report are key indicators that can be used to trigger certain gateways to the ratings, when you trigger so many of these gates you can deduce your rating, on the ratings, you can see VERY SPECIFIC wording will trigger a rating. You should see nearly word for word, these remarks on you C&P result for example:
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100% ratings triggers:
The Ability to Care for Yourself: This individual cannot take care of himself at all. Constant or near-constant hospitalization and one-on-one supervision is required.
Medications: This individual requires psychiatric medication at all times.
Symptoms: Some or all of the following symptoms will be present.
The Ability to Work: This individual cannot work at all.
Social Relationships: This individual cannot participate in any relationships. In other words, they cannot interact or build a relationship with another person. Family members may care for them, but it is only a one-way relationship. They cannot seek, invite, or encourage any relationships.
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They find these specific triggers in your report than you take the average of the triggers to get a proposed rating. Such as "Service member has suicidal tendencies" would be a 100% trigger, but "Member can successfully take care of himself with minimal help" is a 10% trigger, which would average out to 50% rating.... there will be many of these statements on your report, so rate them and average them for your personal best guess. It will be a ballpark number until you get the actual preposed rating back from the VA which will clearly tell you why you received the rating you did, and reason why you didn't receive a higher or lesser rating.
What is PTSD? Military Disability Rating for PTSD <- Link for the gateways to be considered ratable PTSD
Military Disability Ratings for Mental Disorders <- Link to the ratings.