condition mean min max ZT0-3 22.201900000000002 17.53875 26.86505 ZT4-7 26.09425 26.09425 26.09425 ZT8-11 11.3799 11.3799 11.3799 ZT12-15 0 0 0 ZT16-19 9.914835 9.914835 9.914835 ZT20-23 23.197499999999998 23.197499999999998 23.197499999999998