condition mean min max ZT0-3 0.008971871999999999 0.0 0.017943743999999998 ZT4-7 0.052630648749999995 0.0 0.10526129749999999 ZT8-11 1.6760555627499998 0.7056803025 2.6464308229999998 ZT12-15 6.09466545025 4.5886950095 7.600635891 ZT16-19 3.1037079737499997 2.4661321865 3.741283761 ZT20-23 1.470558719 1.1637159185 1.7774015195000001