condition mean min max ZT0-3 11.7141566285 9.769954237 13.658359019999999 ZT4-7 8.665090569250001 7.50915562 9.8210255185 ZT8-11 26.870024612 19.438794409 34.301254815 ZT12-15 23.1988453575 17.406176235 28.991514480000003 ZT16-19 18.274668945 15.842237359999999 20.707100529999998 ZT20-23 21.325090627500003 18.382457090000003 24.267724165