condition mean min max ZT0-3 0.8292140617500001 0.568489806 1.0899383175000001 ZT4-7 2.5051514635 1.5137400175 3.4965629095 ZT8-11 8.215744253 6.141705531 10.289782975000001 ZT12-15 7.53500206675 7.2576311545 7.812372978999999 ZT16-19 2.92922423075 2.456735637 3.4017128245000006 ZT20-23 1.615163122 1.296539459 1.9337867850000001