condition mean min max ZT0-3 27.099999999999998 27.099999999999998 27.099999999999998 ZT4-7 47.0 47.0 47.0 ZT8-11 47.75 47.75 47.75 ZT12-15 28.2 28.2 28.2 ZT16-19 34.3 34.3 34.3 ZT20-23 23.65 23.65 23.65