condition mean min max ZT0-3 3.9383247865 3.7011331460000005 4.175516427 ZT4-7 2.0624946945000002 1.994294299 2.13069509 ZT8-11 3.6450361005 2.3560515475 4.9340206535 ZT12-15 8.9865342505 7.0675051415 10.9055633595 ZT16-19 6.4814293645 5.818921379500001 7.1439373495 ZT20-23 11.39581717275 10.033314625500001 12.75831972