condition mean min max ZT0-3 3.5616878417500004 2.8677996955 4.255575988 ZT4-7 2.25135107075 2.0859629795 2.416739162 ZT8-11 2.72522493475 2.459830839 2.9906190304999996 ZT12-15 3.4592958659999997 3.0043869825 3.9142047494999996 ZT16-19 4.70477501775 4.495903544000001 4.9136464915 ZT20-23 8.6183967535 8.067064849 9.169728658