condition mean min max ZT0-3 0.5878364333333334 0.1976558 1.17442 ZT4-7 2.946205 2.946205 2.946205 ZT8-11 3.519615 3.519615 3.519615 ZT12-15 0.8976995 0.698739 1.09666 ZT16-19 1.4076629999999999 1.4076629999999999 1.4076629999999999 ZT20-23 0.101378 0.101378 0.101378