condition mean min max ZT0-3 13.45707434 12.72603299 14.18811569 ZT4-7 15.679929605 15.44731607 15.91254314 ZT8-11 16.886957885 16.31867742 17.455238350000002 ZT12-15 13.63778830975 12.573745064499999 14.701831555000002 ZT16-19 15.130944262499998 14.625834345 15.636054179999999 ZT20-23 13.8082931125 13.52057184 14.096014385