condition mean min max ZT0-3 894.424289 894.424289 894.424289 ZT4-7 943.690621 943.690621 943.690621 ZT8-11 925.1200114999999 925.1200114999999 925.1200114999999 ZT12-15 939.1987280000001 939.1987280000001 939.1987280000001 ZT16-19 1140.382356 1140.382356 1140.382356 ZT20-23 1252.820819 1252.820819 1252.820819