condition mean min max ZT0-3 0.25259356666666666 0.1626417 0.3969035 ZT4-7 0.28070649999999997 0.28070649999999997 0.28070649999999997 ZT8-11 0.291318 0.291318 0.291318 ZT12-15 0.41468275 0.29974 0.5296255 ZT16-19 0.494845 0.494845 0.494845 ZT20-23 0.445787 0.445787 0.445787