condition mean min max ZT0-3 0.008834766666666667 0.0 0.0132639 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0136738 0.0136738 0.0136738 ZT12-15 0.014967025 0.01482035 0.0151137 ZT16-19 0.01320705 0.01320705 0.01320705 ZT20-23 0.0148924 0.0148924 0.0148924