condition mean min max ZT0-3 1.0736741666666667 0.5153845 1.94525 ZT4-7 0.6520334999999999 0.6520334999999999 0.6520334999999999 ZT8-11 0.826241 0.826241 0.826241 ZT12-15 1.52700225 1.1991095 1.854895 ZT16-19 0.8368475 0.8368475 0.8368475 ZT20-23 0.9065465 0.9065465 0.9065465