condition mean min max ZT0-3 27.55 27.55 27.55 ZT4-7 18.6 18.6 18.6 ZT8-11 16.8 16.8 16.8 ZT12-15 17.1 17.1 17.1 ZT16-19 4.3 4.3 4.3 ZT20-23 27.099999999999998 27.099999999999998 27.099999999999998