condition mean min max ZT0-3 89.807694 89.807694 89.807694 ZT4-7 103.5151955 103.5151955 103.5151955 ZT8-11 130.1059485 130.1059485 130.1059485 ZT12-15 106.81270549999999 106.81270549999999 106.81270549999999 ZT16-19 130.475595 130.475595 130.475595 ZT20-23 163.939416 163.939416 163.939416