condition mean min max ZT0-3 113.427783 113.427783 113.427783 ZT4-7 72.5216425 72.5216425 72.5216425 ZT8-11 88.2675735 88.2675735 88.2675735 ZT12-15 107.5534365 107.5534365 107.5534365 ZT16-19 147.841861 147.841861 147.841861 ZT20-23 176.239573 176.239573 176.239573