condition mean min max ZT0-3 1214.583232 1214.583232 1214.583232 ZT4-7 917.6287970000001 917.6287970000001 917.6287970000001 ZT8-11 853.0685465 853.0685465 853.0685465 ZT12-15 969.875636 969.875636 969.875636 ZT16-19 984.464293 984.464293 984.464293 ZT20-23 1260.58692 1260.58692 1260.58692