condition mean min max ZT0-3 25.549999999999997 25.549999999999997 25.549999999999997 ZT4-7 2.0 2.0 2.0 ZT8-11 34.2 34.2 34.2 ZT12-15 21.099999999999998 21.099999999999998 21.099999999999998 ZT16-19 19.15 19.15 19.15 ZT20-23 31.05 31.05 31.05