condition mean min max ZT0-3 22.25 22.25 22.25 ZT4-7 27.2 27.2 27.2 ZT8-11 6.25 6.25 6.25 ZT12-15 35.75 35.75 35.75 ZT16-19 37.55 37.55 37.55 ZT20-23 32.15 32.15 32.15