condition mean min max ZT0-3 33.932101527499995 28.632664145 39.23153891 ZT4-7 18.75628197 15.657977095 21.854586845 ZT8-11 16.348193839 13.760330513 18.936057165 ZT12-15 2.5803418664999995 0.9560966535 4.2045870794999995 ZT16-19 0.38778459849999997 0.3032603945 0.47230880249999996 ZT20-23 0.6622813845 0.42855681300000004 0.896005956