condition mean min max ZT0-3 1.1398899999999998 1.1398899999999998 1.1398899999999998 ZT4-7 0.654977 0.654977 0.654977 ZT8-11 0.9348974999999999 0.9348974999999999 0.9348974999999999 ZT12-15 0.920697 0.920697 0.920697 ZT16-19 0.7544540000000001 0.7544540000000001 0.7544540000000001 ZT20-23 0.8765114999999999 0.8765114999999999 0.8765114999999999