condition mean min max ZT0-3 9.983226666666667 8.556265 11.342 ZT4-7 13.71875 13.71875 13.71875 ZT8-11 14.10235 14.10235 14.10235 ZT12-15 18.392325 18.0763 18.70835 ZT16-19 14.205 14.205 14.205 ZT20-23 10.6535 10.6535 10.6535