condition mean min max ZT0-3 2.114965166666667 0.0 6.20286 ZT4-7 1.956455 1.956455 1.956455 ZT8-11 0.958265 0.958265 0.958265 ZT12-15 0.588028 0.434866 0.74119 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0