condition mean min max ZT0-3 7.232145 4.285255 8.80349 ZT4-7 4.685925 4.685925 4.685925 ZT8-11 5.48618 5.48618 5.48618 ZT12-15 9.7495375 9.72081 9.778265000000001 ZT16-19 7.67243 7.67243 7.67243 ZT20-23 10.4328 10.4328 10.4328