condition mean min max ZT0-3 1.32835325 1.2019015 1.454805 ZT4-7 1.33782 1.33782 1.33782 ZT8-11 3.3974450000000003 3.3974450000000003 3.3974450000000003 ZT12-15 0 0 0 ZT16-19 6.794925 6.794925 6.794925 ZT20-23 3.11416 3.11416 3.11416