condition mean min max ZT0-3 4.03316240675 3.5838129260000002 4.4825118875 ZT4-7 4.271187766000001 3.5859573195000003 4.956418212500001 ZT8-11 5.4904322180000005 4.950671516 6.03019292 ZT12-15 5.687773959 5.601726979 5.773820939 ZT16-19 5.17921641025 4.843234026499999 5.515198794 ZT20-23 7.472380165000001 7.377655953500001 7.5671043765