condition mean min max ZT0-3 0.025849 0.0 0.051698 ZT4-7 0.356801 0.356801 0.356801 ZT8-11 0.3068845 0.3068845 0.3068845 ZT12-15 0 0 0 ZT16-19 0.2038995 0.2038995 0.2038995 ZT20-23 0.0509165 0.0509165 0.0509165