condition mean min max ZT0-3 2820.6499999999996 2820.6499999999996 2820.6499999999996 ZT4-7 3104.9 3104.9 3104.9 ZT8-11 3206.8500000000004 3206.8500000000004 3206.8500000000004 ZT12-15 3027.45 3027.45 3027.45 ZT16-19 2603.35 2603.35 2603.35 ZT20-23 2747.2 2747.2 2747.2