condition mean min max ZT0-3 0.263732 0.263732 0.263732 ZT4-7 0.14704455 0.14704455 0.14704455 ZT8-11 0.1062907 0.1062907 0.1062907 ZT12-15 0.38006799999999996 0.38006799999999996 0.38006799999999996 ZT16-19 0.42778099999999997 0.42778099999999997 0.42778099999999997 ZT20-23 0.1802895 0.1802895 0.1802895