condition mean min max ZT0-3 3159.3999999999996 3159.3999999999996 3159.3999999999996 ZT4-7 2223.1 2223.1 2223.1 ZT8-11 2203.6499999999996 2203.6499999999996 2203.6499999999996 ZT12-15 2238.95 2238.95 2238.95 ZT16-19 2707.8999999999996 2707.8999999999996 2707.8999999999996 ZT20-23 2998.15 2998.15 2998.15