condition mean min max ZT0-3 817.7 817.7 817.7 ZT4-7 1543.0 1543.0 1543.0 ZT8-11 1437.25 1437.25 1437.25 ZT12-15 1359.95 1359.95 1359.95 ZT16-19 1686.3000000000002 1686.3000000000002 1686.3000000000002 ZT20-23 1418.5500000000002 1418.5500000000002 1418.5500000000002