condition mean min max ZT0-3 316.0858333333333 257.089 353.055 ZT4-7 164.24099999999999 164.24099999999999 164.24099999999999 ZT8-11 94.08765 94.08765 94.08765 ZT12-15 106.4065 105.77449999999999 107.0385 ZT16-19 128.9065 128.9065 128.9065 ZT20-23 230.64249999999998 230.64249999999998 230.64249999999998