condition mean min max ZT0-3 1.1299635 1.1299635 1.1299635 ZT4-7 0.7843899999999999 0.7843899999999999 0.7843899999999999 ZT8-11 0.645618 0.645618 0.645618 ZT12-15 0.7657405 0.7657405 0.7657405 ZT16-19 1.724435 1.724435 1.724435 ZT20-23 1.44773 1.44773 1.44773