condition mean min max ZT0-3 0.1719363345 0.16395929199999998 0.179913377 ZT4-7 0.1724504395 0.12889842699999998 0.216002452 ZT8-11 1.4879765470000001 0.7623023919999999 2.2136507020000002 ZT12-15 4.3433338655 3.3234830764999996 5.3631846545 ZT16-19 2.7407143945 2.5727517915 2.9086769974999998 ZT20-23 4.04937884175 3.9764562835 4.1223014