condition mean min max ZT0-3 137.078211 137.078211 137.078211 ZT4-7 153.44564 153.44564 153.44564 ZT8-11 170.793753 170.793753 170.793753 ZT12-15 168.61624949999998 168.61624949999998 168.61624949999998 ZT16-19 193.00439649999998 193.00439649999998 193.00439649999998 ZT20-23 226.354311 226.354311 226.354311