Stealth stats will ignore any setting unless Unarmed Stats is set to something, anything at all. If Unarmed stats is set to 0, it will force Stealth stats to be treated as though it was 0 as well. While if you change it to even just 1, Stealth stats will function normally and be set to whatever its own value is. This also includes if Stealth stats is set to 0, the game will stat the level to 0 in the affected skills.
Let me know if any more information is needed.