condition mean min max ZT0-3 315.477194 315.477194 315.477194 ZT4-7 403.0043245 403.0043245 403.0043245 ZT8-11 460.211719 460.211719 460.211719 ZT12-15 456.24694750000003 456.24694750000003 456.24694750000003 ZT16-19 558.2356075 558.2356075 558.2356075 ZT20-23 537.2780255 537.2780255 537.2780255