condition mean min max ZT0-3 3.546125 3.546125 3.546125 ZT4-7 2.319715 2.319715 2.319715 ZT8-11 6.370665 6.370665 6.370665 ZT12-15 7.23977 7.23977 7.23977 ZT16-19 4.3913 4.3913 4.3913 ZT20-23 4.7404399999999995 4.7404399999999995 4.7404399999999995