condition mean min max ZT0-3 1.7699574999999999 1.390685 2.1492299999999998 ZT4-7 3.71185 3.71185 3.71185 ZT8-11 1.41114 1.41114 1.41114 ZT12-15 0 0 0 ZT16-19 0.801501 0.801501 0.801501 ZT20-23 0.585337 0.585337 0.585337