condition mean min max ZT0-3 1828.5 1828.5 1828.5 ZT4-7 1471.1 1471.1 1471.1 ZT8-11 1279.5 1279.5 1279.5 ZT12-15 1227.5 1227.5 1227.5 ZT16-19 1572.5500000000002 1572.5500000000002 1572.5500000000002 ZT20-23 1902.9499999999998 1902.9499999999998 1902.9499999999998