condition mean min max ZT0-3 62.75 62.75 62.75 ZT4-7 31.7 31.7 31.7 ZT8-11 19.8 19.8 19.8 ZT12-15 35.8 35.8 35.8 ZT16-19 63.7 63.7 63.7 ZT20-23 9.25 9.25 9.25