condition mean min max ZT0-3 87.078362 87.078362 87.078362 ZT4-7 58.754054999999994 58.754054999999994 58.754054999999994 ZT8-11 39.159479 39.159479 39.159479 ZT12-15 39.50785 39.50785 39.50785 ZT16-19 22.371976 22.371976 22.371976 ZT20-23 23.461986500000002 23.461986500000002 23.461986500000002