condition mean min max ZT0-3 0.9972166666666666 0.3096275 1.6831399999999999 ZT4-7 0.21355105 0.21355105 0.21355105 ZT8-11 0.2711145 0.2711145 0.2711145 ZT12-15 0.47048524999999997 0.38519749999999997 0.555773 ZT16-19 0.9663065 0.9663065 0.9663065 ZT20-23 1.419125 1.419125 1.419125