condition mean min max ZT0-3 8.774604268000001 8.082895144 9.466313392 ZT4-7 4.32266513225 4.020174826 4.6251554385 ZT8-11 3.6616722705 3.1532514154999998 4.1700931255 ZT12-15 5.05938784525 4.1451151835 5.973660507 ZT16-19 5.441756041750001 4.4992093915 6.384302692 ZT20-23 11.12588436975 9.3864608195 12.86530792