condition mean min max ZT0-3 1528.85 1528.85 1528.85 ZT4-7 1379.5 1379.5 1379.5 ZT8-11 1452.9499999999998 1452.9499999999998 1452.9499999999998 ZT12-15 1492.65 1492.65 1492.65 ZT16-19 1450.3000000000002 1450.3000000000002 1450.3000000000002 ZT20-23 1550.1 1550.1 1550.1