condition mean min max ZT0-3 20.255084895000003 17.791583420000002 22.71858637 ZT4-7 25.37400243 21.32683467 29.42117019 ZT8-11 19.373811805000003 18.641072893333334 20.106550716666668 ZT12-15 22.576534251666665 22.243253516666666 22.909814986666667 ZT16-19 13.605821807833333 11.432555109 15.779088506666668 ZT20-23 12.515022819 11.757118088 13.27292755