condition mean min max ZT0-3 74.9 74.9 74.9 ZT4-7 42.7 42.7 42.7 ZT8-11 81.15 81.15 81.15 ZT12-15 68.69999999999999 68.69999999999999 68.69999999999999 ZT16-19 71.69999999999999 71.69999999999999 71.69999999999999 ZT20-23 99.9 99.9 99.9