condition mean min max ZT0-3 27.806024999999998 26.07385 29.5382 ZT4-7 27.221049999999998 27.221049999999998 27.221049999999998 ZT8-11 22.073349999999998 22.073349999999998 22.073349999999998 ZT12-15 0 0 0 ZT16-19 21.97585 21.97585 21.97585 ZT20-23 25.65935 25.65935 25.65935