condition mean min max ZT0-3 1.25274325 1.0879765 1.41751 ZT4-7 0.794618 0.794618 0.794618 ZT8-11 1.658965 1.658965 1.658965 ZT12-15 0 0 0 ZT16-19 1.801725 1.801725 1.801725 ZT20-23 1.674255 1.674255 1.674255