condition mean min max ZT0-3 20.55 20.55 20.55 ZT4-7 28.8 28.8 28.8 ZT8-11 27.8 27.8 27.8 ZT12-15 37.25 37.25 37.25 ZT16-19 14.1 14.1 14.1 ZT20-23 35.95 35.95 35.95