condition mean min max ZT0-3 376.30898 376.30898 376.30898 ZT4-7 477.43152599999996 477.43152599999996 477.43152599999996 ZT8-11 493.87495750000005 493.87495750000005 493.87495750000005 ZT12-15 499.63127 499.63127 499.63127 ZT16-19 464.116672 464.116672 464.116672 ZT20-23 432.4437195 432.4437195 432.4437195