Formula for primary stats on level up?

I'm creating a stat level up calculator and was reading through this guide > https://www.gamefaqs.com/pc/130791-final-fantasy-vii/faqs/36775

For leveling up on primary stats, it says "This difference is then capped at 0 to 11 inclusive", however I see the number can be calculated above 11 when testing with my java code...

    // Dexterity
    int levelUp = 7; // cloud starting level(6)
    dex = 6; // cloud starting dexterity at level 6
    baseNumber = 6; // cloud rank curve is 6 (for dex), and is within 2-11 levelUp bracket, so 6 is the number on table
    gradient = 72; // cloud rank curve is 6 (for dex), and is within 2-11 levelUp bracket, so 72 is the number on table
    baselineStat = baseNumber + ((gradient * levelUp) / 100);
    randomStatDifferenceOne = 1 + baselineStat - dex;
    randomStatDifferenceTwo = 2 + baselineStat - dex;
    randomStatDifferenceThree = 3 + baselineStat - dex;
    randomStatDifferenceFour = 4 + baselineStat - dex;
    randomStatDifferenceFive = 5 + baselineStat - dex;
    randomStatDifferenceSix = 6 + baselineStat - dex;
    randomStatDifferenceSeven = 7 + baselineStat - dex;
    randomStatDifferenceEight = 8 + baselineStat - dex;
    System.out.println(randomStatDifferenceOne);
    System.out.println(randomStatDifferenceTwo);
    System.out.println(randomStatDifferenceThree);
    System.out.println(randomStatDifferenceFour);
    System.out.println(randomStatDifferenceFive);
    System.out.println(randomStatDifferenceSix);
    System.out.println(randomStatDifferenceSeven);
    System.out.println(randomStatDifferenceEight);

This gives me the following results with Rnd(1-8):

6
7
8
9
10
11
12
13

In the guide... he has the following level up stat calculated as follows for the difference number (that should only be 0-11):

     *     Difference | Stat Gain
     *         0-3    |     0
     *         4-6    |     1
     *         7-9    |     2
     *        10-11   |     3

So my question is how is it handled when the number is above 11, or below 0(assuming below 0 is possible)?