condition mean min max ZT0-3 17.7648248635 16.483999996999998 19.04564973 ZT4-7 7.773981807999999 7.403949524 8.144014091999999 ZT8-11 13.060390148249999 10.272627091499999 15.848153205 ZT12-15 13.89473274 12.428369804999999 15.361095675000001 ZT16-19 12.26391975 10.567625055 13.960214445 ZT20-23 17.577974607500003 16.732871080000002 18.423078135