condition mean min max ZT0-3 0.53580167425 0.29147391899999997 0.7801294295 ZT4-7 2.2869289955000003 1.9287812225 2.6450767685 ZT8-11 4.5771295845 3.1142752490000003 6.039983919999999 ZT12-15 7.2240341305 6.901184834 7.546883426999999 ZT16-19 4.2574253322499995 3.6616858695000003 4.853164795 ZT20-23 2.140348159 1.7076054935 2.5730908245000004