condition mean min max ZT0-3 0.2181115 0.215466 0.220757 ZT4-7 1.1054849999999998 1.1054849999999998 1.1054849999999998 ZT8-11 0.6577835000000001 0.6577835000000001 0.6577835000000001 ZT12-15 0 0 0 ZT16-19 1.517611 1.517611 1.517611 ZT20-23 0.8716425 0.8716425 0.8716425