condition mean min max ZT0-3 27.606 27.606 27.606 ZT4-7 18.0139 18.0139 18.0139 ZT8-11 19.76715 19.76715 19.76715 ZT12-15 17.52235 17.52235 17.52235 ZT16-19 32.020250000000004 32.020250000000004 32.020250000000004 ZT20-23 29.5517 29.5517 29.5517