condition mean min max ZT0-3 0.404022 0.3090315 0.49901249999999997 ZT4-7 1.5873599999999999 1.5873599999999999 1.5873599999999999 ZT8-11 2.79861 2.79861 2.79861 ZT12-15 0 0 0 ZT16-19 1.241385 1.241385 1.241385 ZT20-23 0.8355605 0.8355605 0.8355605