condition mean min max ZT0-3 3.3708366666666665 2.512278333333333 4.229395 ZT4-7 4.7666200000000005 4.7666200000000005 4.7666200000000005 ZT8-11 2.79787 2.79787 2.79787 ZT12-15 5.20391375 4.12403 6.2837975 ZT16-19 9.513845 7.34041 11.68728 ZT20-23 0 0 0