condition mean min max ZT0-3 2.60700713025 1.8213646435 3.392649617 ZT4-7 1.5646981687500001 1.345758821 1.7836375165 ZT8-11 1.7035825787499999 1.6825239539999999 1.7246412035 ZT12-15 2.4109628177499998 1.867401572 2.9545240635 ZT16-19 2.5918557865 2.0503631725 3.1333484005 ZT20-23 3.6122821527499998 3.5759928284999996 3.648571477