condition mean min max ZT0-3 22.71415 22.71415 22.71415 ZT4-7 19.06655 19.06655 19.06655 ZT8-11 20.92725 20.92725 20.92725 ZT12-15 20.135550000000002 20.135550000000002 20.135550000000002 ZT16-19 21.448349999999998 21.448349999999998 21.448349999999998 ZT20-23 16.72295 16.72295 16.72295