condition mean min max ZT0-3 2557.6499999999996 2557.6499999999996 2557.6499999999996 ZT4-7 2253.0 2253.0 2253.0 ZT8-11 2205.3999999999996 2205.3999999999996 2205.3999999999996 ZT12-15 2259.2 2259.2 2259.2 ZT16-19 2224.7 2224.7 2224.7 ZT20-23 2525.6 2525.6 2525.6