condition mean min max ZT0-3 1461.3000000000002 1461.3000000000002 1461.3000000000002 ZT4-7 1658.8 1658.8 1658.8 ZT8-11 1629.1 1629.1 1629.1 ZT12-15 1982.55 1982.55 1982.55 ZT16-19 2178.2 2178.2 2178.2 ZT20-23 2525.8500000000004 2525.8500000000004 2525.8500000000004