condition mean min max ZT0-3 0.31723250000000003 0.31723250000000003 0.31723250000000003 ZT4-7 0.5131275 0.5131275 0.5131275 ZT8-11 1.1446399999999999 1.1446399999999999 1.1446399999999999 ZT12-15 0.6148785 0.6148785 0.6148785 ZT16-19 0.294699 0.294699 0.294699 ZT20-23 0.281514 0.281514 0.281514