condition mean min max ZT0-3 1556.8 1556.8 1556.8 ZT4-7 1428.4 1428.4 1428.4 ZT8-11 1816.8000000000002 1816.8000000000002 1816.8000000000002 ZT12-15 2294.7 2294.7 2294.7 ZT16-19 2348.3 2348.3 2348.3 ZT20-23 2183.75 2183.75 2183.75