condition mean min max ZT0-3 103.83184 103.83184 103.83184 ZT4-7 174.39670999999998 174.39670999999998 174.39670999999998 ZT8-11 316.284848 316.284848 316.284848 ZT12-15 420.7924285 420.7924285 420.7924285 ZT16-19 260.388972 260.388972 260.388972 ZT20-23 230.91909099999998 230.91909099999998 230.91909099999998