condition mean min max ZT0-3 0.24448749999999997 0.1411585 0.3478165 ZT4-7 0.9951715 0.9951715 0.9951715 ZT8-11 0.6405545 0.6405545 0.6405545 ZT12-15 0 0 0 ZT16-19 0.486046 0.486046 0.486046 ZT20-23 0.5584374999999999 0.5584374999999999 0.5584374999999999