condition mean min max ZT0-3 500.017618 500.017618 500.017618 ZT4-7 446.3149555 446.3149555 446.3149555 ZT8-11 450.874137 450.874137 450.874137 ZT12-15 404.870742 404.870742 404.870742 ZT16-19 335.16530850000004 335.16530850000004 335.16530850000004 ZT20-23 339.4217105 339.4217105 339.4217105