condition mean min max ZT0-3 405.294518 405.294518 405.294518 ZT4-7 234.1373125 234.1373125 234.1373125 ZT8-11 211.2822625 211.2822625 211.2822625 ZT12-15 277.3373735 277.3373735 277.3373735 ZT16-19 375.51661750000005 375.51661750000005 375.51661750000005 ZT20-23 364.7260225 364.7260225 364.7260225