condition mean min max ZT0-3 910.012621 910.012621 910.012621 ZT4-7 761.5771545 761.5771545 761.5771545 ZT8-11 874.570433 874.570433 874.570433 ZT12-15 825.0245659999999 825.0245659999999 825.0245659999999 ZT16-19 1278.7378015 1278.7378015 1278.7378015 ZT20-23 999.0220690000001 999.0220690000001 999.0220690000001