condition mean min max ZT0-3 83.992432 83.992432 83.992432 ZT4-7 220.89711499999999 220.89711499999999 220.89711499999999 ZT8-11 194.19867299999999 194.19867299999999 194.19867299999999 ZT12-15 164.93969850000002 164.93969850000002 164.93969850000002 ZT16-19 143.661224 143.661224 143.661224 ZT20-23 101.94722999999999 101.94722999999999 101.94722999999999