condition mean min max ZT0-3 213.421271 213.421271 213.421271 ZT4-7 254.112409 254.112409 254.112409 ZT8-11 270.762896 270.762896 270.762896 ZT12-15 297.5142225 297.5142225 297.5142225 ZT16-19 261.401114 261.401114 261.401114 ZT20-23 190.7135005 190.7135005 190.7135005