condition mean min max ZT0-3 33.4903 33.4903 33.4903 ZT4-7 7.555669999999999 7.555669999999999 7.555669999999999 ZT8-11 7.174004999999999 7.174004999999999 7.174004999999999 ZT12-15 15.554549999999999 15.554549999999999 15.554549999999999 ZT16-19 34.72885 34.72885 34.72885 ZT20-23 22.04625 22.04625 22.04625