condition mean min max ZT0-3 1.7321625 1.570745 1.89358 ZT4-7 1.51471 1.51471 1.51471 ZT8-11 1.515685 1.515685 1.515685 ZT12-15 0 0 0 ZT16-19 1.05772 1.05772 1.05772 ZT20-23 1.106913 1.106913 1.106913