condition mean min max ZT0-3 1465.087988 1465.087988 1465.087988 ZT4-7 193.7802825 193.7802825 193.7802825 ZT8-11 370.473832 370.473832 370.473832 ZT12-15 815.57209 815.57209 815.57209 ZT16-19 1794.039749 1794.039749 1794.039749 ZT20-23 1971.030216 1971.030216 1971.030216