condition mean min max ZT0-3 2.22146 2.22146 2.22146 ZT4-7 1.8420450000000002 1.8420450000000002 1.8420450000000002 ZT8-11 2.702715 2.702715 2.702715 ZT12-15 2.003525 2.003525 2.003525 ZT16-19 3.709765 3.709765 3.709765 ZT20-23 2.355995 2.355995 2.355995