condition mean min max ZT0-3 11.950000000000001 11.950000000000001 11.950000000000001 ZT4-7 0.8 0.8 0.8 ZT8-11 14.200000000000001 14.200000000000001 14.200000000000001 ZT12-15 22.799999999999997 22.799999999999997 22.799999999999997 ZT16-19 10.35 10.35 10.35 ZT20-23 11.75 11.75 11.75