condition mean min max ZT0-3 7.37767213575 4.0520534515 10.70329082 ZT4-7 7.1865371197500005 5.8975520335 8.475522206 ZT8-11 11.850995774000001 8.838619743 14.863371805 ZT12-15 15.264609725 15.136525625 15.392693824999998 ZT16-19 18.907036007499997 18.496177655 19.317894359999997 ZT20-23 20.0770587725 19.592578605 20.56153894