condition mean min max ZT0-3 4.09298 3.9624550000000003 4.223504999999999 ZT4-7 2.556715 2.556715 2.556715 ZT8-11 3.66087 3.66087 3.66087 ZT12-15 0 0 0 ZT16-19 5.71058 5.71058 5.71058 ZT20-23 5.561385 5.561385 5.561385