condition mean min max ZT0-3 1.211975 1.211975 1.211975 ZT4-7 1.100808 1.100808 1.100808 ZT8-11 1.091805 1.091805 1.091805 ZT12-15 0.505321 0.505321 0.505321 ZT16-19 1.7074349999999998 1.7074349999999998 1.7074349999999998 ZT20-23 1.58623 1.58623 1.58623