condition mean min max ZT0-3 8.883030000000002 4.72481 13.041250000000002 ZT4-7 12.112322500000001 12.112322500000001 12.112322500000001 ZT8-11 15.44697 15.44697 15.44697 ZT12-15 0 0 0 ZT16-19 26.041510000000002 26.041510000000002 26.041510000000002 ZT20-23 1.86685 1.86685 1.86685