condition mean min max ZT0-3 144.135 113.6645 167.0075 ZT4-7 51.8532 51.8532 51.8532 ZT8-11 4.80049 4.80049 4.80049 ZT12-15 6.1066 4.48137 7.73183 ZT16-19 5.791015 5.791015 5.791015 ZT20-23 44.516549999999995 44.516549999999995 44.516549999999995