condition mean min max ZT0-3 305.944153 305.944153 305.944153 ZT4-7 787.9579845000001 787.9579845000001 787.9579845000001 ZT8-11 422.7740035 422.7740035 422.7740035 ZT12-15 466.022503 466.022503 466.022503 ZT16-19 239.240035 239.240035 239.240035 ZT20-23 187.462569 187.462569 187.462569