condition mean min max ZT0-3 14.716325000000001 9.430724999999999 19.057650000000002 ZT4-7 3.70446 3.70446 3.70446 ZT8-11 0.5617725 0.5617725 0.5617725 ZT12-15 4.23997 1.166065 7.3138749999999995 ZT16-19 2.819915 2.819915 2.819915 ZT20-23 9.40939 9.40939 9.40939