condition mean min max ZT0-3 82.5 82.5 82.5 ZT4-7 47.3 47.3 47.3 ZT8-11 46.25 46.25 46.25 ZT12-15 66.1 66.1 66.1 ZT16-19 71.69999999999999 71.69999999999999 71.69999999999999 ZT20-23 90.05 90.05 90.05