Condicion unids

in version 1.0, the percentage of conditions that made me lose a unit was: ((x-1) * x) * 100 = the result was the% that made me lose a unit from the stack. (x = number of units of the same type)

in version 1.5 everything seems to change. As far as I could observe, each unit is equivalent to 5% of life to die, that is, if I have 4 units, the first will die at 15% of life. the second with 10%, the third with 5% and the last with 0%. Can anyone confirm me? And if you know the calculation, please tell me.