condition mean min max ZT0-3 3.4956250000000004 3.340125 3.6511250000000004 ZT4-7 4.315505 4.315505 4.315505 ZT8-11 4.615795 4.615795 4.615795 ZT12-15 0 0 0 ZT16-19 5.757805 5.757805 5.757805 ZT20-23 4.93089 4.93089 4.93089