condition mean min max ZT0-3 637.375032 637.375032 637.375032 ZT4-7 479.1500665 479.1500665 479.1500665 ZT8-11 451.322955 451.322955 451.322955 ZT12-15 430.9623795 430.9623795 430.9623795 ZT16-19 659.089659 659.089659 659.089659 ZT20-23 646.52102 646.52102 646.52102