condition mean min max ZT0-3 0.7994753166666667 0.10243495 1.36575 ZT4-7 0.5827795 0.5827795 0.5827795 ZT8-11 0.38203299999999996 0.38203299999999996 0.38203299999999996 ZT12-15 1.1501735 1.029642 1.270705 ZT16-19 1.706365 1.706365 1.706365 ZT20-23 1.88638 1.88638 1.88638